SmogRank / Episodes / Thailand

Thailand and Laos, March 2025

For 10 days, from 20 to 29 March 2025, 53 cities in Thailand and Laos had PM2.5 at least twice their usual for the time of year. The worst reading was Vientiane, Vientiane Prefecture, Laos: 154.0 µg/m³ on 24 March, about 2.7× its usual 57.7.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached53in 2 countries
Days1020 to 29 March 2025
Worst day24 March42 cities counted
Furthest above usual5.2×Ban Chang

Day by day

24 March 42 cities at twice their usual or more
Lat KrabangBang NaNong ChokBan Khlong PrawetSaphan SungBueng KumKhlong Sam WaKhan Na YaoBan Samae DamSai MaiLak SiSuphan BuriChai NatNakhon SawanSi Sa KetPhichitKalasinAmnat CharoenKamphaeng PhetMukdahanMae SotUttaraditTrangPhraeLampangNanLamphunBetongChiang MaiPhayaoPattaniRoi EtSadaoKanchanaburiRatchaburiYasothonKhon KaenHua HinNakhon NayokMaha SarakhamSing BuriPhetchabunRanongPhra Nakhon Si AyutthayaNakhon RatchasimaChaiyaphumUdon ThaniNong Bua LamphuSukhothaiBang Bo DistrictSaraburiSurinLop BuriUbon RatchathaniPhatthalungBuri RamNakhon LuangSakon NakhonBang KapiSi Maha PhotBang PakongLoeiChumphonLaem ChabangPhra PradaengVientianeRayongChanthaburiSamut PrakanTratMueang NonthaburiPakxanBangkokNakhon PathomPhetchaburiKhlong LuangBan Talat BuengAranyaprathetPrachin BuriNong KhaemSamut SakhonBan PhaeoBan Chang
17 Mar18192021222324252627282930311 Apr
Every measured city in the area, coloured by its PM2.5 that day; a dark ring marks a city at twice its usual or more. Bars: cities counted each day, coloured by their median level. Choose a day or press play; without JavaScript, the days link to that day's world ranking.

How it spread

Ban ChangBan Chang, 17 March: no readingBan Chang, 18 March: 31.1 µg/m³Ban Chang, 19 March: 45.6 µg/m³Ban Chang, 20 March: 69.8 µg/m³, 3.3× its usual 21.1Ban Chang, 21 March: 82.7 µg/m³, 3.9× its usual 21.0Ban Chang, 22 March: 89.7 µg/m³, 4.2× its usual 21.2Ban Chang, 23 March: 97.0 µg/m³, 4.6× its usual 21.3Ban Chang, 24 March: 110.0 µg/m³, 5.2× its usual 21.3Ban Chang, 25 March: 78.6 µg/m³, 3.7× its usual 21.3Ban Chang, 26 March: 68.2 µg/m³, 3.2× its usual 21.6Ban Chang, 27 March: 67.2 µg/m³, 3.1× its usual 21.5Ban Chang, 28 March: 70.4 µg/m³, 3.3× its usual 21.4Ban Chang, 29 March: 70.4 µg/m³, 3.3× its usual 21.4Ban Chang, 30 March: 61.3 µg/m³Ban Chang, 31 March: 40.3 µg/m³Ban Chang, 1 April: 29.5 µg/m³Nong KhaemNong Khaem, 17 March: 15.2 µg/m³Nong Khaem, 18 March: 24.3 µg/m³Nong Khaem, 19 March: 29.8 µg/m³Nong Khaem, 20 March: 51.2 µg/m³, 2.0× its usual 25.3Nong Khaem, 21 March: 64.8 µg/m³, 2.6× its usual 25.2Nong Khaem, 22 March: 66.1 µg/m³, 2.6× its usual 25.3Nong Khaem, 23 March: 102.0 µg/m³, 4.0× its usual 25.3Nong Khaem, 24 March: 93.7 µg/m³, 3.7× its usual 25.3Nong Khaem, 25 March: 67.6 µg/m³, 2.7× its usual 25.3Nong Khaem, 26 March: 59.8 µg/m³, 2.4× its usual 25.3Nong Khaem, 27 March: 55.6 µg/m³, 2.2× its usual 25.1Nong Khaem, 28 March: 47.2 µg/m³Nong Khaem, 29 March: 43.1 µg/m³Nong Khaem, 30 March: 36.2 µg/m³Nong Khaem, 31 March: 27.3 µg/m³Nong Khaem, 1 April: 30.4 µg/m³Ban PhaeoBan Phaeo, 17 March: no readingBan Phaeo, 18 March: no readingBan Phaeo, 19 March: no readingBan Phaeo, 20 March: 44.2 µg/m³, 2.5× its usual 17.8Ban Phaeo, 21 March: 54.1 µg/m³, 3.0× its usual 17.8Ban Phaeo, 22 March: 58.7 µg/m³, 3.5× its usual 16.6Ban Phaeo, 23 March: 69.4 µg/m³, 4.2× its usual 16.4Ban Phaeo, 24 March: 62.3 µg/m³, 3.9× its usual 16.1Ban Phaeo, 25 March: 43.2 µg/m³, 2.7× its usual 16.3Ban Phaeo, 26 March: 43.2 µg/m³, 2.7× its usual 16.1Ban Phaeo, 27 March: 36.8 µg/m³, 2.3× its usual 15.9Ban Phaeo, 28 March: 34.4 µg/m³, 2.1× its usual 16.3Ban Phaeo, 29 March: 38.1 µg/m³, 2.3× its usual 16.6Ban Phaeo, 30 March: 31.6 µg/m³Ban Phaeo, 31 March: 19.8 µg/m³Ban Phaeo, 1 April: 16.5 µg/m³Samut SakhonSamut Sakhon, 17 March: 10.4 µg/m³Samut Sakhon, 18 March: 11.0 µg/m³Samut Sakhon, 19 March: 21.0 µg/m³Samut Sakhon, 20 March: 42.4 µg/m³, 2.2× its usual 19.6Samut Sakhon, 21 March: 64.2 µg/m³, 3.3× its usual 19.6Samut Sakhon, 22 March: 68.8 µg/m³, 3.5× its usual 19.6Samut Sakhon, 23 March: 82.3 µg/m³, 4.1× its usual 19.9Samut Sakhon, 24 March: 62.5 µg/m³, 3.1× its usual 20.3Samut Sakhon, 25 March: 39.9 µg/m³Samut Sakhon, 26 March: 39.9 µg/m³Samut Sakhon, 27 March: 33.9 µg/m³Samut Sakhon, 28 March: 34.3 µg/m³Samut Sakhon, 29 March: 38.4 µg/m³Samut Sakhon, 30 March: 31.6 µg/m³Samut Sakhon, 31 March: 20.1 µg/m³Samut Sakhon, 1 April: 18.5 µg/m³PhetchaburiPhetchaburi, 17 March: 15.8 µg/m³Phetchaburi, 18 March: 14.1 µg/m³Phetchaburi, 19 March: 22.9 µg/m³Phetchaburi, 20 March: 44.0 µg/m³Phetchaburi, 21 March: 64.5 µg/m³, 2.7× its usual 23.9Phetchaburi, 22 March: 65.2 µg/m³, 2.7× its usual 23.9Phetchaburi, 23 March: 70.6 µg/m³, 2.9× its usual 24.0Phetchaburi, 24 March: 62.3 µg/m³, 2.6× its usual 24.3Phetchaburi, 25 March: 51.2 µg/m³, 2.1× its usual 24.3Phetchaburi, 26 March: 46.0 µg/m³Phetchaburi, 27 March: 39.1 µg/m³Phetchaburi, 28 March: 35.9 µg/m³Phetchaburi, 29 March: 39.9 µg/m³Phetchaburi, 30 March: 33.9 µg/m³Phetchaburi, 31 March: 22.9 µg/m³Phetchaburi, 1 April: 17.4 µg/m³Nakhon PathomNakhon Pathom, 17 March: 15.2 µg/m³Nakhon Pathom, 18 March: 15.5 µg/m³Nakhon Pathom, 19 March: 29.5 µg/m³Nakhon Pathom, 20 March: 42.1 µg/m³Nakhon Pathom, 21 March: 55.8 µg/m³, 2.4× its usual 23.4Nakhon Pathom, 22 March: 59.4 µg/m³, 2.5× its usual 23.4Nakhon Pathom, 23 March: 68.6 µg/m³, 2.9× its usual 23.6Nakhon Pathom, 24 March: 66.5 µg/m³, 2.8× its usual 23.7Nakhon Pathom, 25 March: 52.1 µg/m³, 2.2× its usual 23.7Nakhon Pathom, 26 March: 48.4 µg/m³, 2.1× its usual 23.4Nakhon Pathom, 27 March: 39.6 µg/m³Nakhon Pathom, 28 March: 38.9 µg/m³Nakhon Pathom, 29 March: 43.8 µg/m³Nakhon Pathom, 30 March: 39.8 µg/m³Nakhon Pathom, 31 March: 24.3 µg/m³Nakhon Pathom, 1 April: 24.1 µg/m³Bang Bo DistrictBang Bo District, 17 March: 18.7 µg/m³Bang Bo District, 18 March: 22.4 µg/m³Bang Bo District, 19 March: 28.4 µg/m³Bang Bo District, 20 March: no readingBang Bo District, 21 March: 54.3 µg/m³, 2.4× its usual 22.2Bang Bo District, 22 March: 49.1 µg/m³, 2.2× its usual 22.2Bang Bo District, 23 March: 51.4 µg/m³, 2.3× its usual 22.2Bang Bo District, 24 March: 48.5 µg/m³, 2.2× its usual 22.2Bang Bo District, 25 March: 36.0 µg/m³Bang Bo District, 26 March: 33.8 µg/m³Bang Bo District, 27 March: 33.6 µg/m³Bang Bo District, 28 March: 34.8 µg/m³Bang Bo District, 29 March: 35.5 µg/m³Bang Bo District, 30 March: 30.8 µg/m³Bang Bo District, 31 March: 27.5 µg/m³Bang Bo District, 1 April: 21.9 µg/m³Mueang NonthaburiMueang Nonthaburi, 17 March: 16.0 µg/m³Mueang Nonthaburi, 18 March: 18.9 µg/m³Mueang Nonthaburi, 19 March: 26.4 µg/m³Mueang Nonthaburi, 20 March: 37.8 µg/m³Mueang Nonthaburi, 21 March: 49.3 µg/m³, 2.2× its usual 22.4Mueang Nonthaburi, 22 March: 53.6 µg/m³, 2.4× its usual 22.5Mueang Nonthaburi, 23 March: 60.4 µg/m³, 2.7× its usual 22.5Mueang Nonthaburi, 24 March: 62.5 µg/m³, 2.8× its usual 22.6Mueang Nonthaburi, 25 March: 46.2 µg/m³, 2.0× its usual 22.6Mueang Nonthaburi, 26 March: 40.5 µg/m³Mueang Nonthaburi, 27 March: 36.8 µg/m³Mueang Nonthaburi, 28 March: 35.3 µg/m³Mueang Nonthaburi, 29 March: 33.4 µg/m³Mueang Nonthaburi, 30 March: 29.7 µg/m³Mueang Nonthaburi, 31 March: 23.5 µg/m³Mueang Nonthaburi, 1 April: 20.6 µg/m³BangkokBangkok, 17 March: 17.6 µg/m³Bangkok, 18 March: 20.1 µg/m³Bangkok, 19 March: 28.4 µg/m³Bangkok, 20 March: 38.5 µg/m³Bangkok, 21 March: 47.8 µg/m³, 2.1× its usual 23.0Bangkok, 22 March: 51.5 µg/m³, 2.2× its usual 23.1Bangkok, 23 March: 65.6 µg/m³, 2.8× its usual 23.1Bangkok, 24 March: 67.1 µg/m³, 2.9× its usual 23.1Bangkok, 25 March: 48.1 µg/m³, 2.1× its usual 23.1Bangkok, 26 March: 44.0 µg/m³Bangkok, 27 March: 41.2 µg/m³Bangkok, 28 March: 38.1 µg/m³Bangkok, 29 March: 37.8 µg/m³Bangkok, 30 March: 34.1 µg/m³Bangkok, 31 March: 28.8 µg/m³Bangkok, 1 April: 26.6 µg/m³Hua HinHua Hin, 17 March: 21.4 µg/m³Hua Hin, 18 March: 19.9 µg/m³Hua Hin, 19 March: 21.2 µg/m³Hua Hin, 20 March: 34.1 µg/m³Hua Hin, 21 March: 43.3 µg/m³, 2.0× its usual 21.2Hua Hin, 22 March: 45.3 µg/m³, 2.2× its usual 21.0Hua Hin, 23 March: 43.9 µg/m³, 2.1× its usual 21.0Hua Hin, 24 March: 41.5 µg/m³Hua Hin, 25 March: 37.5 µg/m³Hua Hin, 26 March: 39.8 µg/m³Hua Hin, 27 March: 34.6 µg/m³Hua Hin, 28 March: 28.8 µg/m³Hua Hin, 29 March: 31.5 µg/m³Hua Hin, 30 March: 29.3 µg/m³Hua Hin, 31 March: 24.5 µg/m³Hua Hin, 1 April: 21.2 µg/m³TratTrat, 17 March: 17.4 µg/m³Trat, 18 March: 41.4 µg/m³Trat, 19 March: 44.9 µg/m³Trat, 20 March: 34.4 µg/m³Trat, 21 March: 43.0 µg/m³, 2.0× its usual 21.0Trat, 22 March: 40.2 µg/m³Trat, 23 March: 49.9 µg/m³, 2.4× its usual 21.0Trat, 24 March: 58.4 µg/m³, 2.8× its usual 20.9Trat, 25 March: 50.6 µg/m³, 2.4× its usual 20.8Trat, 26 March: 47.7 µg/m³, 2.3× its usual 20.9Trat, 27 March: no readingTrat, 28 March: no readingTrat, 29 March: 35.4 µg/m³Trat, 30 March: 27.9 µg/m³Trat, 31 March: 23.7 µg/m³Trat, 1 April: 16.8 µg/m³Ban Talat BuengBan Talat Bueng, 17 March: 19.6 µg/m³Ban Talat Bueng, 18 March: 23.7 µg/m³Ban Talat Bueng, 19 March: 32.3 µg/m³Ban Talat Bueng, 20 March: 41.2 µg/m³Ban Talat Bueng, 21 March: 42.7 µg/m³, 2.0× its usual 21.3Ban Talat Bueng, 22 March: 47.4 µg/m³, 2.2× its usual 21.6Ban Talat Bueng, 23 March: 60.3 µg/m³, 2.8× its usual 21.6Ban Talat Bueng, 24 March: 64.4 µg/m³, 3.0× its usual 21.6Ban Talat Bueng, 25 March: 49.7 µg/m³, 2.3× its usual 21.3Ban Talat Bueng, 26 March: 43.7 µg/m³, 2.1× its usual 21.3Ban Talat Bueng, 27 March: 42.8 µg/m³, 2.0× its usual 21.3Ban Talat Bueng, 28 March: 42.6 µg/m³, 2.0× its usual 21.2Ban Talat Bueng, 29 March: 45.4 µg/m³, 2.1× its usual 21.2Ban Talat Bueng, 30 March: 39.3 µg/m³Ban Talat Bueng, 31 March: 27.4 µg/m³Ban Talat Bueng, 1 April: 27.8 µg/m³ChanthaburiChanthaburi, 17 March: 13.5 µg/m³Chanthaburi, 18 March: 18.3 µg/m³Chanthaburi, 19 March: 25.9 µg/m³Chanthaburi, 20 March: 34.7 µg/m³Chanthaburi, 21 March: 42.3 µg/m³, 2.3× its usual 18.6Chanthaburi, 22 March: 39.4 µg/m³, 2.1× its usual 18.5Chanthaburi, 23 March: 51.2 µg/m³, 2.8× its usual 18.5Chanthaburi, 24 March: 52.9 µg/m³, 2.8× its usual 18.6Chanthaburi, 25 March: 44.3 µg/m³, 2.4× its usual 18.6Chanthaburi, 26 March: 36.9 µg/m³Chanthaburi, 27 March: 33.9 µg/m³Chanthaburi, 28 March: 37.2 µg/m³, 2.0× its usual 18.6Chanthaburi, 29 March: 35.9 µg/m³Chanthaburi, 30 March: 32.1 µg/m³Chanthaburi, 31 March: 21.8 µg/m³Chanthaburi, 1 April: 13.5 µg/m³Samut PrakanSamut Prakan, 17 March: 12.0 µg/m³Samut Prakan, 18 March: 13.5 µg/m³Samut Prakan, 19 March: 20.8 µg/m³Samut Prakan, 20 March: 35.7 µg/m³Samut Prakan, 21 March: 40.7 µg/m³, 2.1× its usual 19.4Samut Prakan, 22 March: 48.7 µg/m³, 2.5× its usual 19.5Samut Prakan, 23 March: 54.2 µg/m³, 2.8× its usual 19.5Samut Prakan, 24 March: 54.6 µg/m³, 2.8× its usual 19.6Samut Prakan, 25 March: 37.3 µg/m³Samut Prakan, 26 March: 33.1 µg/m³Samut Prakan, 27 March: 30.8 µg/m³Samut Prakan, 28 March: 34.5 µg/m³Samut Prakan, 29 March: 35.2 µg/m³Samut Prakan, 30 March: 28.8 µg/m³Samut Prakan, 31 March: 22.1 µg/m³Samut Prakan, 1 April: 17.4 µg/m³ChumphonChumphon, 17 March: 11.9 µg/m³Chumphon, 18 March: 13.3 µg/m³Chumphon, 19 March: 12.4 µg/m³Chumphon, 20 March: 20.7 µg/m³Chumphon, 21 March: 39.7 µg/m³, 2.6× its usual 15.4Chumphon, 22 March: 39.7 µg/m³, 2.6× its usual 15.0Chumphon, 23 March: 40.0 µg/m³, 2.7× its usual 14.9Chumphon, 24 March: 37.2 µg/m³, 2.5× its usual 14.9Chumphon, 25 March: 33.8 µg/m³, 2.3× its usual 14.5Chumphon, 26 March: 38.1 µg/m³, 2.6× its usual 14.4Chumphon, 27 March: 29.9 µg/m³, 2.1× its usual 14.4Chumphon, 28 March: 27.1 µg/m³Chumphon, 29 March: 25.7 µg/m³Chumphon, 30 March: 25.7 µg/m³Chumphon, 31 March: 15.9 µg/m³Chumphon, 1 April: 9.9 µg/m³RayongRayong, 17 March: 12.0 µg/m³Rayong, 18 March: 15.5 µg/m³Rayong, 19 March: 24.8 µg/m³Rayong, 20 March: 34.1 µg/m³Rayong, 21 March: 39.3 µg/m³, 2.1× its usual 18.3Rayong, 22 March: 39.8 µg/m³, 2.2× its usual 18.3Rayong, 23 March: 50.5 µg/m³, 2.7× its usual 18.4Rayong, 24 March: 51.2 µg/m³, 2.8× its usual 18.5Rayong, 25 March: 37.2 µg/m³, 2.0× its usual 18.5Rayong, 26 March: 32.9 µg/m³Rayong, 27 March: 34.9 µg/m³Rayong, 28 March: 32.8 µg/m³Rayong, 29 March: 32.5 µg/m³Rayong, 30 March: 28.0 µg/m³Rayong, 31 March: 18.3 µg/m³Rayong, 1 April: 15.1 µg/m³RanongRanong, 17 March: 13.4 µg/m³Ranong, 18 March: 15.5 µg/m³Ranong, 19 March: 14.2 µg/m³Ranong, 20 March: 22.0 µg/m³Ranong, 21 March: 38.0 µg/m³, 2.2× its usual 17.5Ranong, 22 March: 36.6 µg/m³, 2.1× its usual 17.5Ranong, 23 March: 38.0 µg/m³, 2.2× its usual 17.4Ranong, 24 March: 35.7 µg/m³, 2.1× its usual 17.4Ranong, 25 March: 37.8 µg/m³, 2.2× its usual 17.5Ranong, 26 March: 39.2 µg/m³, 2.3× its usual 17.4Ranong, 27 March: 31.6 µg/m³Ranong, 28 March: 28.2 µg/m³Ranong, 29 March: 27.2 µg/m³Ranong, 30 March: 22.3 µg/m³Ranong, 31 March: 15.1 µg/m³Ranong, 1 April: 11.1 µg/m³Khlong LuangKhlong Luang, 17 March: 23.3 µg/m³Khlong Luang, 18 March: 22.7 µg/m³Khlong Luang, 19 March: 37.1 µg/m³Khlong Luang, 20 March: 46.7 µg/m³Khlong Luang, 21 March: 52.4 µg/m³Khlong Luang, 22 March: 57.2 µg/m³, 2.1× its usual 27.2Khlong Luang, 23 March: 75.9 µg/m³, 2.8× its usual 27.5Khlong Luang, 24 March: 80.1 µg/m³, 2.9× its usual 28.0Khlong Luang, 25 March: 58.8 µg/m³, 2.1× its usual 28.1Khlong Luang, 26 March: 49.1 µg/m³Khlong Luang, 27 March: 37.9 µg/m³Khlong Luang, 28 March: 36.8 µg/m³Khlong Luang, 29 March: 38.7 µg/m³Khlong Luang, 30 March: no readingKhlong Luang, 31 March: no readingKhlong Luang, 1 April: 25.1 µg/m³Phra PradaengPhra Pradaeng, 17 March: 15.7 µg/m³Phra Pradaeng, 18 March: 18.5 µg/m³Phra Pradaeng, 19 March: 28.0 µg/m³Phra Pradaeng, 20 March: 37.1 µg/m³Phra Pradaeng, 21 March: 44.5 µg/m³Phra Pradaeng, 22 March: 49.9 µg/m³, 2.2× its usual 22.8Phra Pradaeng, 23 March: 61.8 µg/m³, 2.7× its usual 22.8Phra Pradaeng, 24 March: 62.4 µg/m³, 2.7× its usual 22.9Phra Pradaeng, 25 March: 43.8 µg/m³Phra Pradaeng, 26 March: 39.8 µg/m³Phra Pradaeng, 27 March: 39.0 µg/m³Phra Pradaeng, 28 March: 38.9 µg/m³Phra Pradaeng, 29 March: 39.3 µg/m³Phra Pradaeng, 30 March: 33.8 µg/m³Phra Pradaeng, 31 March: 26.3 µg/m³Phra Pradaeng, 1 April: 21.6 µg/m³Laem ChabangLaem Chabang, 17 March: 16.2 µg/m³Laem Chabang, 18 March: 18.2 µg/m³Laem Chabang, 19 March: 24.8 µg/m³Laem Chabang, 20 March: 33.6 µg/m³Laem Chabang, 21 March: 36.5 µg/m³Laem Chabang, 22 March: 41.3 µg/m³, 2.2× its usual 18.9Laem Chabang, 23 March: 50.4 µg/m³, 2.7× its usual 18.9Laem Chabang, 24 March: no readingLaem Chabang, 25 March: no readingLaem Chabang, 26 March: no readingLaem Chabang, 27 March: no readingLaem Chabang, 28 March: no readingLaem Chabang, 29 March: 38.0 µg/m³, 2.0× its usual 18.9Laem Chabang, 30 March: 31.4 µg/m³Laem Chabang, 31 March: 22.4 µg/m³Laem Chabang, 1 April: 19.4 µg/m³VientianeVientiane, 17 March: 31.2 µg/m³Vientiane, 18 March: 36.2 µg/m³Vientiane, 19 March: 52.5 µg/m³Vientiane, 20 March: 62.9 µg/m³Vientiane, 21 March: 89.6 µg/m³Vientiane, 22 March: 111.5 µg/m³Vientiane, 23 March: 141.5 µg/m³, 2.5× its usual 56.9Vientiane, 24 March: 154.0 µg/m³, 2.7× its usual 57.7Vientiane, 25 March: 150.0 µg/m³, 2.6× its usual 57.4Vientiane, 26 March: 139.5 µg/m³, 2.4× its usual 57.1Vientiane, 27 March: 111.0 µg/m³Vientiane, 28 March: 107.0 µg/m³Vientiane, 29 March: 89.2 µg/m³Vientiane, 30 March: 28.4 µg/m³Vientiane, 31 March: 42.2 µg/m³Vientiane, 1 April: 55.1 µg/m³PakxanPakxan, 17 March: 23.3 µg/m³Pakxan, 18 March: 20.6 µg/m³Pakxan, 19 March: 22.3 µg/m³Pakxan, 20 March: 27.1 µg/m³Pakxan, 21 March: 43.4 µg/m³Pakxan, 22 March: 62.3 µg/m³Pakxan, 23 March: 101.0 µg/m³, 2.4× its usual 41.3Pakxan, 24 March: 125.0 µg/m³, 2.8× its usual 43.9Pakxan, 25 March: 120.0 µg/m³, 2.7× its usual 43.9Pakxan, 26 March: no readingPakxan, 27 March: no readingPakxan, 28 March: no readingPakxan, 29 March: no readingPakxan, 30 March: no readingPakxan, 31 March: 17.8 µg/m³Pakxan, 1 April: 51.2 µg/m³Nong Bua LamphuNong Bua Lamphu, 17 March: 24.4 µg/m³Nong Bua Lamphu, 18 March: 18.0 µg/m³Nong Bua Lamphu, 19 March: 26.2 µg/m³Nong Bua Lamphu, 20 March: 36.6 µg/m³Nong Bua Lamphu, 21 March: 41.0 µg/m³Nong Bua Lamphu, 22 March: 55.7 µg/m³Nong Bua Lamphu, 23 March: 83.0 µg/m³, 2.3× its usual 36.1Nong Bua Lamphu, 24 March: 86.8 µg/m³, 2.3× its usual 37.2Nong Bua Lamphu, 25 March: 88.7 µg/m³, 2.3× its usual 38.8Nong Bua Lamphu, 26 March: 86.4 µg/m³, 2.2× its usual 39.4Nong Bua Lamphu, 27 March: 69.2 µg/m³Nong Bua Lamphu, 28 March: 72.9 µg/m³Nong Bua Lamphu, 29 March: 79.4 µg/m³, 2.1× its usual 37.6Nong Bua Lamphu, 30 March: 44.0 µg/m³Nong Bua Lamphu, 31 March: 13.5 µg/m³Nong Bua Lamphu, 1 April: 18.1 µg/m³Bang PakongBang Pakong, 17 March: 25.5 µg/m³Bang Pakong, 18 March: 38.4 µg/m³Bang Pakong, 19 March: 42.7 µg/m³Bang Pakong, 20 March: 51.5 µg/m³Bang Pakong, 21 March: 55.9 µg/m³Bang Pakong, 22 March: 58.3 µg/m³Bang Pakong, 23 March: 80.5 µg/m³, 2.6× its usual 31.2Bang Pakong, 24 March: 70.6 µg/m³, 2.3× its usual 31.0Bang Pakong, 25 March: 52.4 µg/m³Bang Pakong, 26 March: 47.8 µg/m³Bang Pakong, 27 March: 49.7 µg/m³Bang Pakong, 28 March: 49.9 µg/m³Bang Pakong, 29 March: 49.6 µg/m³Bang Pakong, 30 March: 39.7 µg/m³Bang Pakong, 31 March: 35.8 µg/m³Bang Pakong, 1 April: 39.5 µg/m³Nakhon LuangNakhon Luang, 17 March: 21.6 µg/m³Nakhon Luang, 18 March: 24.1 µg/m³Nakhon Luang, 19 March: 29.2 µg/m³Nakhon Luang, 20 March: 39.6 µg/m³Nakhon Luang, 21 March: 47.2 µg/m³Nakhon Luang, 22 March: 51.1 µg/m³Nakhon Luang, 23 March: 73.1 µg/m³, 2.4× its usual 30.2Nakhon Luang, 24 March: 76.3 µg/m³, 2.5× its usual 30.5Nakhon Luang, 25 March: 58.1 µg/m³Nakhon Luang, 26 March: 44.9 µg/m³Nakhon Luang, 27 March: 39.3 µg/m³Nakhon Luang, 28 March: 38.7 µg/m³Nakhon Luang, 29 March: 41.4 µg/m³Nakhon Luang, 30 March: 33.9 µg/m³Nakhon Luang, 31 March: 29.0 µg/m³Nakhon Luang, 1 April: 43.1 µg/m³Prachin BuriPrachin Buri, 17 March: 29.6 µg/m³Prachin Buri, 18 March: 32.5 µg/m³Prachin Buri, 19 March: 30.4 µg/m³Prachin Buri, 20 March: 39.2 µg/m³Prachin Buri, 21 March: 44.2 µg/m³Prachin Buri, 22 March: 50.6 µg/m³Prachin Buri, 23 March: 72.8 µg/m³, 2.7× its usual 27.3Prachin Buri, 24 March: 85.6 µg/m³, 3.2× its usual 27.1Prachin Buri, 25 March: 67.0 µg/m³, 2.5× its usual 26.9Prachin Buri, 26 March: 53.9 µg/m³, 2.0× its usual 26.7Prachin Buri, 27 March: 48.2 µg/m³Prachin Buri, 28 March: 46.3 µg/m³Prachin Buri, 29 March: 49.4 µg/m³Prachin Buri, 30 March: 41.5 µg/m³Prachin Buri, 31 March: 29.1 µg/m³Prachin Buri, 1 April: 41.9 µg/m³AranyaprathetAranyaprathet, 17 March: 18.3 µg/m³Aranyaprathet, 18 March: 28.7 µg/m³Aranyaprathet, 19 March: 25.3 µg/m³Aranyaprathet, 20 March: 35.5 µg/m³Aranyaprathet, 21 March: 36.4 µg/m³Aranyaprathet, 22 March: 42.5 µg/m³Aranyaprathet, 23 March: 69.6 µg/m³, 3.0× its usual 22.9Aranyaprathet, 24 March: 72.4 µg/m³, 3.1× its usual 23.0Aranyaprathet, 25 March: 51.2 µg/m³, 2.2× its usual 22.9Aranyaprathet, 26 March: 38.8 µg/m³Aranyaprathet, 27 March: 34.1 µg/m³Aranyaprathet, 28 March: 33.1 µg/m³Aranyaprathet, 29 March: 33.2 µg/m³Aranyaprathet, 30 March: 24.8 µg/m³Aranyaprathet, 31 March: 21.7 µg/m³Aranyaprathet, 1 April: 25.2 µg/m³SurinSurin, 17 March: 26.5 µg/m³Surin, 18 March: 24.0 µg/m³Surin, 19 March: 26.6 µg/m³Surin, 20 March: 40.5 µg/m³Surin, 21 March: 39.2 µg/m³Surin, 22 March: 49.3 µg/m³Surin, 23 March: 65.2 µg/m³, 2.2× its usual 29.7Surin, 24 March: 69.9 µg/m³, 2.3× its usual 29.9Surin, 25 March: 73.6 µg/m³, 2.4× its usual 30.1Surin, 26 March: 62.6 µg/m³, 2.1× its usual 29.9Surin, 27 March: 47.3 µg/m³Surin, 28 March: 41.3 µg/m³Surin, 29 March: 38.1 µg/m³Surin, 30 March: 29.4 µg/m³Surin, 31 March: 20.0 µg/m³Surin, 1 April: 20.0 µg/m³RatchaburiRatchaburi, 17 March: 22.1 µg/m³Ratchaburi, 18 March: 20.0 µg/m³Ratchaburi, 19 March: 29.2 µg/m³Ratchaburi, 20 March: 48.7 µg/m³Ratchaburi, 21 March: 59.7 µg/m³Ratchaburi, 22 March: 60.2 µg/m³Ratchaburi, 23 March: 63.6 µg/m³, 2.0× its usual 31.6Ratchaburi, 24 March: 67.8 µg/m³, 2.1× its usual 31.8Ratchaburi, 25 March: 57.4 µg/m³Ratchaburi, 26 March: 55.4 µg/m³Ratchaburi, 27 March: 45.3 µg/m³Ratchaburi, 28 March: 41.5 µg/m³Ratchaburi, 29 March: 45.4 µg/m³Ratchaburi, 30 March: 42.0 µg/m³Ratchaburi, 31 March: 29.6 µg/m³Ratchaburi, 1 April: 23.0 µg/m³Si Maha PhotSi Maha Phot, 17 March: 29.8 µg/m³Si Maha Phot, 18 March: 32.7 µg/m³Si Maha Phot, 19 March: 34.2 µg/m³Si Maha Phot, 20 March: 41.5 µg/m³Si Maha Phot, 21 March: 44.9 µg/m³Si Maha Phot, 22 March: 50.5 µg/m³Si Maha Phot, 23 March: 62.9 µg/m³, 2.0× its usual 31.1Si Maha Phot, 24 March: 80.4 µg/m³, 2.6× its usual 31.1Si Maha Phot, 25 March: 64.7 µg/m³, 2.1× its usual 31.1Si Maha Phot, 26 March: 48.9 µg/m³Si Maha Phot, 27 March: 48.2 µg/m³Si Maha Phot, 28 March: no readingSi Maha Phot, 29 March: no readingSi Maha Phot, 30 March: no readingSi Maha Phot, 31 March: 28.8 µg/m³Si Maha Phot, 1 April: 34.9 µg/m³Phra Nakhon Si Ayut…Phra Nakhon Si Ayutthaya, 17 March: 18.8 µg/m³Phra Nakhon Si Ayutthaya, 18 March: 20.5 µg/m³Phra Nakhon Si Ayutthaya, 19 March: 23.9 µg/m³Phra Nakhon Si Ayutthaya, 20 March: 39.5 µg/m³Phra Nakhon Si Ayutthaya, 21 March: 44.3 µg/m³Phra Nakhon Si Ayutthaya, 22 March: 45.7 µg/m³Phra Nakhon Si Ayutthaya, 23 March: 60.6 µg/m³, 2.2× its usual 27.2Phra Nakhon Si Ayutthaya, 24 March: 63.3 µg/m³, 2.3× its usual 27.3Phra Nakhon Si Ayutthaya, 25 March: 54.3 µg/m³Phra Nakhon Si Ayutthaya, 26 March: 46.5 µg/m³Phra Nakhon Si Ayutthaya, 27 March: 53.7 µg/m³Phra Nakhon Si Ayutthaya, 28 March: 50.9 µg/m³Phra Nakhon Si Ayutthaya, 29 March: 60.7 µg/m³, 2.2× its usual 27.2Phra Nakhon Si Ayutthaya, 30 March: 39.9 µg/m³Phra Nakhon Si Ayutthaya, 31 March: 27.3 µg/m³Phra Nakhon Si Ayutthaya, 1 April: 39.8 µg/m³Bang KapiBang Kapi, 17 March: 20.0 µg/m³Bang Kapi, 18 March: 22.7 µg/m³Bang Kapi, 19 March: 30.0 µg/m³Bang Kapi, 20 March: 33.8 µg/m³Bang Kapi, 21 March: 42.3 µg/m³Bang Kapi, 22 March: 45.5 µg/m³Bang Kapi, 23 March: 60.5 µg/m³, 2.5× its usual 23.8Bang Kapi, 24 March: 61.6 µg/m³, 2.6× its usual 23.8Bang Kapi, 25 March: 44.6 µg/m³Bang Kapi, 26 March: 38.8 µg/m³Bang Kapi, 27 March: 36.8 µg/m³Bang Kapi, 28 March: 38.8 µg/m³Bang Kapi, 29 March: 39.8 µg/m³Bang Kapi, 30 March: 35.3 µg/m³Bang Kapi, 31 March: 30.4 µg/m³Bang Kapi, 1 April: 26.6 µg/m³SaraburiSaraburi, 17 March: 19.0 µg/m³Saraburi, 18 March: 24.5 µg/m³Saraburi, 19 March: 26.8 µg/m³Saraburi, 20 March: no readingSaraburi, 21 March: 39.4 µg/m³Saraburi, 22 March: 45.3 µg/m³Saraburi, 23 March: 56.3 µg/m³, 2.1× its usual 27.2Saraburi, 24 March: 66.1 µg/m³, 2.4× its usual 27.2Saraburi, 25 March: 52.9 µg/m³Saraburi, 26 March: 44.0 µg/m³Saraburi, 27 March: 40.5 µg/m³Saraburi, 28 March: 38.5 µg/m³Saraburi, 29 March: 37.6 µg/m³Saraburi, 30 March: 35.1 µg/m³Saraburi, 31 March: 26.9 µg/m³Saraburi, 1 April: 31.9 µg/m³LoeiLoei, 17 March: 33.7 µg/m³Loei, 18 March: 25.9 µg/m³Loei, 19 March: 37.4 µg/m³Loei, 20 March: 51.8 µg/m³Loei, 21 March: 61.1 µg/m³Loei, 22 March: 75.1 µg/m³Loei, 23 March: 92.4 µg/m³Loei, 24 March: 111.0 µg/m³, 2.4× its usual 46.9Loei, 25 March: 125.0 µg/m³, 2.6× its usual 48.6Loei, 26 March: 132.0 µg/m³, 2.6× its usual 50.1Loei, 27 March: 76.1 µg/m³Loei, 28 March: 59.4 µg/m³Loei, 29 March: 67.1 µg/m³Loei, 30 March: 42.9 µg/m³Loei, 31 March: 18.0 µg/m³Loei, 1 April: 28.0 µg/m³SukhothaiSukhothai, 17 March: 44.3 µg/m³Sukhothai, 18 March: 32.7 µg/m³Sukhothai, 19 March: 38.3 µg/m³Sukhothai, 20 March: 53.3 µg/m³Sukhothai, 21 March: 63.7 µg/m³Sukhothai, 22 March: 72.5 µg/m³Sukhothai, 23 March: 81.6 µg/m³Sukhothai, 24 March: 86.7 µg/m³, 2.0× its usual 42.9Sukhothai, 25 March: 90.7 µg/m³, 2.1× its usual 43.3Sukhothai, 26 March: 99.2 µg/m³, 2.3× its usual 43.2Sukhothai, 27 March: 77.1 µg/m³Sukhothai, 28 March: 70.0 µg/m³Sukhothai, 29 March: 98.2 µg/m³, 2.3× its usual 43.4Sukhothai, 30 March: 94.1 µg/m³Sukhothai, 31 March: 39.6 µg/m³Sukhothai, 1 April: 34.0 µg/m³Lop BuriLop Buri, 17 March: 31.3 µg/m³Lop Buri, 18 March: 35.4 µg/m³Lop Buri, 19 March: 33.6 µg/m³Lop Buri, 20 March: 45.3 µg/m³Lop Buri, 21 March: 49.0 µg/m³Lop Buri, 22 March: 50.3 µg/m³Lop Buri, 23 March: 64.8 µg/m³Lop Buri, 24 March: 82.1 µg/m³, 2.4× its usual 34.4Lop Buri, 25 March: 72.1 µg/m³, 2.1× its usual 34.4Lop Buri, 26 March: 59.3 µg/m³Lop Buri, 27 March: 52.3 µg/m³Lop Buri, 28 March: 49.1 µg/m³Lop Buri, 29 March: 50.3 µg/m³Lop Buri, 30 March: 44.3 µg/m³Lop Buri, 31 March: 29.9 µg/m³Lop Buri, 1 April: 47.8 µg/m³PhetchabunPhetchabun, 17 March: 25.8 µg/m³Phetchabun, 18 March: 29.8 µg/m³Phetchabun, 19 March: 32.0 µg/m³Phetchabun, 20 March: 44.9 µg/m³Phetchabun, 21 March: 56.9 µg/m³Phetchabun, 22 March: 64.8 µg/m³Phetchabun, 23 March: 71.6 µg/m³Phetchabun, 24 March: 81.9 µg/m³, 2.2× its usual 36.7Phetchabun, 25 March: 79.5 µg/m³, 2.2× its usual 36.7Phetchabun, 26 March: 69.6 µg/m³Phetchabun, 27 March: 58.3 µg/m³Phetchabun, 28 March: 56.1 µg/m³Phetchabun, 29 March: 53.6 µg/m³Phetchabun, 30 March: 50.5 µg/m³Phetchabun, 31 March: 36.3 µg/m³Phetchabun, 1 April: 30.8 µg/m³Sing BuriSing Buri, 17 March: 31.3 µg/m³Sing Buri, 18 March: 28.1 µg/m³Sing Buri, 19 March: 32.9 µg/m³Sing Buri, 20 March: 43.6 µg/m³Sing Buri, 21 March: 49.5 µg/m³Sing Buri, 22 March: 55.8 µg/m³Sing Buri, 23 March: 73.1 µg/m³Sing Buri, 24 March: 81.8 µg/m³, 2.2× its usual 37.3Sing Buri, 25 March: 67.8 µg/m³Sing Buri, 26 March: 55.4 µg/m³Sing Buri, 27 March: 48.8 µg/m³Sing Buri, 28 March: 45.7 µg/m³Sing Buri, 29 March: 51.4 µg/m³Sing Buri, 30 March: 50.0 µg/m³Sing Buri, 31 March: 30.7 µg/m³Sing Buri, 1 April: 49.6 µg/m³ChaiyaphumChaiyaphum, 17 March: 20.8 µg/m³Chaiyaphum, 18 March: 26.8 µg/m³Chaiyaphum, 19 March: 27.9 µg/m³Chaiyaphum, 20 March: 40.3 µg/m³Chaiyaphum, 21 March: 41.7 µg/m³Chaiyaphum, 22 March: 44.2 µg/m³Chaiyaphum, 23 March: 56.3 µg/m³Chaiyaphum, 24 March: 78.8 µg/m³, 2.1× its usual 37.0Chaiyaphum, 25 March: 84.2 µg/m³, 2.3× its usual 37.0Chaiyaphum, 26 March: 71.2 µg/m³Chaiyaphum, 27 March: 60.8 µg/m³Chaiyaphum, 28 March: 56.1 µg/m³Chaiyaphum, 29 March: 51.9 µg/m³Chaiyaphum, 30 March: 39.9 µg/m³Chaiyaphum, 31 March: 20.9 µg/m³Chaiyaphum, 1 April: 22.4 µg/m³Nakhon RatchasimaNakhon Ratchasima, 17 March: 27.0 µg/m³Nakhon Ratchasima, 18 March: 29.4 µg/m³Nakhon Ratchasima, 19 March: 27.4 µg/m³Nakhon Ratchasima, 20 March: 43.1 µg/m³Nakhon Ratchasima, 21 March: 49.7 µg/m³Nakhon Ratchasima, 22 March: 45.8 µg/m³Nakhon Ratchasima, 23 March: 63.0 µg/m³Nakhon Ratchasima, 24 March: 77.7 µg/m³, 2.3× its usual 33.6Nakhon Ratchasima, 25 March: 76.2 µg/m³, 2.2× its usual 33.9Nakhon Ratchasima, 26 March: 62.0 µg/m³Nakhon Ratchasima, 27 March: 57.0 µg/m³Nakhon Ratchasima, 28 March: 50.8 µg/m³Nakhon Ratchasima, 29 March: 43.1 µg/m³Nakhon Ratchasima, 30 March: 38.3 µg/m³Nakhon Ratchasima, 31 March: 25.3 µg/m³Nakhon Ratchasima, 1 April: 25.5 µg/m³Udon ThaniUdon Thani, 17 March: 21.3 µg/m³Udon Thani, 18 March: 15.3 µg/m³Udon Thani, 19 March: 25.3 µg/m³Udon Thani, 20 March: 33.6 µg/m³Udon Thani, 21 March: 40.0 µg/m³Udon Thani, 22 March: 45.2 µg/m³Udon Thani, 23 March: 62.4 µg/m³Udon Thani, 24 March: 76.5 µg/m³, 2.0× its usual 38.1Udon Thani, 25 March: 86.7 µg/m³, 2.3× its usual 38.4Udon Thani, 26 March: 79.9 µg/m³, 2.0× its usual 39.1Udon Thani, 27 March: 70.4 µg/m³Udon Thani, 28 March: 58.2 µg/m³Udon Thani, 29 March: 53.2 µg/m³Udon Thani, 30 March: 32.0 µg/m³Udon Thani, 31 March: 13.1 µg/m³Udon Thani, 1 April: 14.2 µg/m³Maha SarakhamMaha Sarakham, 17 March: 21.8 µg/m³Maha Sarakham, 18 March: 24.3 µg/m³Maha Sarakham, 19 March: 31.9 µg/m³Maha Sarakham, 20 March: 43.0 µg/m³Maha Sarakham, 21 March: 42.7 µg/m³Maha Sarakham, 22 March: 46.3 µg/m³Maha Sarakham, 23 March: 57.5 µg/m³Maha Sarakham, 24 March: 72.5 µg/m³, 2.0× its usual 35.7Maha Sarakham, 25 March: 78.6 µg/m³, 2.2× its usual 36.4Maha Sarakham, 26 March: 73.9 µg/m³, 2.0× its usual 36.5Maha Sarakham, 27 March: 62.3 µg/m³Maha Sarakham, 28 March: 54.8 µg/m³Maha Sarakham, 29 March: 53.0 µg/m³Maha Sarakham, 30 March: 34.0 µg/m³Maha Sarakham, 31 March: no readingMaha Sarakham, 1 April: no readingKanchanaburiKanchanaburi, 17 March: 26.8 µg/m³Kanchanaburi, 18 March: 27.2 µg/m³Kanchanaburi, 19 March: 34.9 µg/m³Kanchanaburi, 20 March: 38.6 µg/m³Kanchanaburi, 21 March: 52.8 µg/m³Kanchanaburi, 22 March: 49.7 µg/m³Kanchanaburi, 23 March: 56.5 µg/m³Kanchanaburi, 24 March: 65.1 µg/m³, 2.1× its usual 31.7Kanchanaburi, 25 March: 61.7 µg/m³Kanchanaburi, 26 March: 50.3 µg/m³Kanchanaburi, 27 March: 49.4 µg/m³Kanchanaburi, 28 March: 43.9 µg/m³Kanchanaburi, 29 March: 46.1 µg/m³Kanchanaburi, 30 March: no readingKanchanaburi, 31 March: no readingKanchanaburi, 1 April: 40.1 µg/m³Nakhon NayokNakhon Nayok, 17 March: 15.7 µg/m³Nakhon Nayok, 18 March: 21.3 µg/m³Nakhon Nayok, 19 March: 16.8 µg/m³Nakhon Nayok, 20 March: 22.0 µg/m³Nakhon Nayok, 21 March: 28.3 µg/m³Nakhon Nayok, 22 March: 31.0 µg/m³Nakhon Nayok, 23 March: 39.0 µg/m³Nakhon Nayok, 24 March: 50.4 µg/m³, 2.1× its usual 23.6Nakhon Nayok, 25 March: 51.7 µg/m³, 2.2× its usual 23.6Nakhon Nayok, 26 March: 51.4 µg/m³, 2.2× its usual 23.4Nakhon Nayok, 27 March: 42.5 µg/m³Nakhon Nayok, 28 March: 44.0 µg/m³Nakhon Nayok, 29 March: 32.5 µg/m³Nakhon Nayok, 30 March: 35.7 µg/m³Nakhon Nayok, 31 March: 24.0 µg/m³Nakhon Nayok, 1 April: 24.9 µg/m³Khon KaenKhon Kaen, 17 March: 31.4 µg/m³Khon Kaen, 18 March: 33.8 µg/m³Khon Kaen, 19 March: 38.9 µg/m³Khon Kaen, 20 March: 51.3 µg/m³Khon Kaen, 21 March: 51.8 µg/m³Khon Kaen, 22 March: no readingKhon Kaen, 23 March: no readingKhon Kaen, 24 March: no readingKhon Kaen, 25 March: 91.6 µg/m³, 2.1× its usual 43.2Khon Kaen, 26 March: 89.9 µg/m³, 2.1× its usual 43.0Khon Kaen, 27 March: 76.4 µg/m³Khon Kaen, 28 March: no readingKhon Kaen, 29 March: no readingKhon Kaen, 30 March: 37.8 µg/m³Khon Kaen, 31 March: 23.6 µg/m³Khon Kaen, 1 April: 28.7 µg/m³Roi EtRoi Et, 17 March: 21.1 µg/m³Roi Et, 18 March: 20.5 µg/m³Roi Et, 19 March: 32.1 µg/m³Roi Et, 20 March: 50.2 µg/m³Roi Et, 21 March: 43.2 µg/m³Roi Et, 22 March: 46.4 µg/m³Roi Et, 23 March: 56.9 µg/m³Roi Et, 24 March: 74.8 µg/m³Roi Et, 25 March: 87.2 µg/m³, 2.0× its usual 43.3Roi Et, 26 March: 83.4 µg/m³Roi Et, 27 March: 68.3 µg/m³Roi Et, 28 March: 58.5 µg/m³Roi Et, 29 March: 55.1 µg/m³Roi Et, 30 March: 30.1 µg/m³Roi Et, 31 March: 15.5 µg/m³Roi Et, 1 April: 18.7 µg/m³Buri RamBuri Ram, 17 March: 26.4 µg/m³Buri Ram, 18 March: 24.2 µg/m³Buri Ram, 19 March: 25.9 µg/m³Buri Ram, 20 March: 41.2 µg/m³Buri Ram, 21 March: 41.4 µg/m³Buri Ram, 22 March: 49.9 µg/m³Buri Ram, 23 March: no readingBuri Ram, 24 March: no readingBuri Ram, 25 March: 74.5 µg/m³, 2.5× its usual 29.3Buri Ram, 26 March: 63.3 µg/m³, 2.2× its usual 29.3Buri Ram, 27 March: 48.7 µg/m³Buri Ram, 28 March: 42.2 µg/m³Buri Ram, 29 March: 40.4 µg/m³Buri Ram, 30 March: 32.3 µg/m³Buri Ram, 31 March: 20.9 µg/m³Buri Ram, 1 April: 22.3 µg/m³Ubon RatchathaniUbon Ratchathani, 17 March: 40.3 µg/m³Ubon Ratchathani, 18 March: 19.2 µg/m³Ubon Ratchathani, 19 March: 21.9 µg/m³Ubon Ratchathani, 20 March: 35.0 µg/m³Ubon Ratchathani, 21 March: 38.1 µg/m³Ubon Ratchathani, 22 March: 55.9 µg/m³Ubon Ratchathani, 23 March: 64.3 µg/m³Ubon Ratchathani, 24 March: 80.0 µg/m³Ubon Ratchathani, 25 March: 109.0 µg/m³Ubon Ratchathani, 26 March: 133.0 µg/m³, 2.4× its usual 55.0Ubon Ratchathani, 27 March: 126.0 µg/m³Ubon Ratchathani, 28 March: 109.0 µg/m³Ubon Ratchathani, 29 March: 112.0 µg/m³, 2.0× its usual 56.0Ubon Ratchathani, 30 March: 59.1 µg/m³Ubon Ratchathani, 31 March: 18.6 µg/m³Ubon Ratchathani, 1 April: 18.4 µg/m³Sakon NakhonSakon Nakhon, 17 March: 16.7 µg/m³Sakon Nakhon, 18 March: 16.3 µg/m³Sakon Nakhon, 19 March: 31.9 µg/m³Sakon Nakhon, 20 March: 36.9 µg/m³Sakon Nakhon, 21 March: 36.5 µg/m³Sakon Nakhon, 22 March: 41.1 µg/m³Sakon Nakhon, 23 March: 39.9 µg/m³Sakon Nakhon, 24 March: 49.4 µg/m³Sakon Nakhon, 25 March: 68.0 µg/m³Sakon Nakhon, 26 March: 92.4 µg/m³, 2.5× its usual 36.9Sakon Nakhon, 27 March: 78.5 µg/m³Sakon Nakhon, 28 March: 70.4 µg/m³Sakon Nakhon, 29 March: 60.5 µg/m³Sakon Nakhon, 30 March: 27.0 µg/m³Sakon Nakhon, 31 March: 10.2 µg/m³Sakon Nakhon, 1 April: 12.1 µg/m³YasothonYasothon, 17 March: 31.0 µg/m³Yasothon, 18 March: 27.2 µg/m³Yasothon, 19 March: 34.7 µg/m³Yasothon, 20 March: 46.6 µg/m³Yasothon, 21 March: 44.2 µg/m³Yasothon, 22 March: 49.8 µg/m³Yasothon, 23 March: 56.9 µg/m³Yasothon, 24 March: 67.1 µg/m³Yasothon, 25 March: 77.3 µg/m³Yasothon, 26 March: 86.4 µg/m³, 2.1× its usual 41.9Yasothon, 27 March: 76.1 µg/m³Yasothon, 28 March: 64.2 µg/m³Yasothon, 29 March: 68.2 µg/m³Yasothon, 30 March: 40.0 µg/m³Yasothon, 31 March: 26.8 µg/m³Yasothon, 1 April: 27.8 µg/m³PhatthalungPhatthalung, 17 March: 18.6 µg/m³Phatthalung, 18 March: 11.9 µg/m³Phatthalung, 19 March: 14.6 µg/m³Phatthalung, 20 March: 17.5 µg/m³Phatthalung, 21 March: 18.1 µg/m³Phatthalung, 22 March: 26.7 µg/m³Phatthalung, 23 March: 23.1 µg/m³Phatthalung, 24 March: 17.8 µg/m³Phatthalung, 25 March: 23.8 µg/m³Phatthalung, 26 March: 32.5 µg/m³, 2.5× its usual 13.2Phatthalung, 27 March: 27.9 µg/m³, 2.1× its usual 13.2Phatthalung, 28 March: 21.7 µg/m³Phatthalung, 29 March: 20.9 µg/m³Phatthalung, 30 March: 21.8 µg/m³Phatthalung, 31 March: 18.9 µg/m³Phatthalung, 1 April: 14.0 µg/m³SadaoSadao, 17 March: 14.6 µg/m³Sadao, 18 March: 12.3 µg/m³Sadao, 19 March: 17.4 µg/m³Sadao, 20 March: 21.3 µg/m³Sadao, 21 March: 22.1 µg/m³Sadao, 22 March: 29.8 µg/m³Sadao, 23 March: 23.2 µg/m³Sadao, 24 March: 18.7 µg/m³Sadao, 25 March: 22.2 µg/m³Sadao, 26 March: 32.1 µg/m³, 2.1× its usual 15.1Sadao, 27 March: 30.2 µg/m³, 2.0× its usual 15.1Sadao, 28 March: 26.4 µg/m³Sadao, 29 March: 29.3 µg/m³Sadao, 30 March: 22.3 µg/m³Sadao, 31 March: 20.9 µg/m³Sadao, 1 April: 16.4 µg/m³PattaniPattani, 17 March: 10.3 µg/m³Pattani, 18 March: 11.9 µg/m³Pattani, 19 March: 15.9 µg/m³Pattani, 20 March: 20.8 µg/m³Pattani, 21 March: 20.9 µg/m³Pattani, 22 March: 28.0 µg/m³Pattani, 23 March: 20.3 µg/m³Pattani, 24 March: 18.4 µg/m³Pattani, 25 March: 20.8 µg/m³Pattani, 26 March: 28.5 µg/m³, 2.0× its usual 14.0Pattani, 27 March: 27.4 µg/m³Pattani, 28 March: 21.0 µg/m³Pattani, 29 March: 19.2 µg/m³Pattani, 30 March: 20.6 µg/m³Pattani, 31 March: 19.1 µg/m³Pattani, 1 April: 12.1 µg/m³17 Mar192123252729311 Apr
Every counted city, in the order the episode reached them, 3 days before to 3 after. Each square is a day, coloured by that day's PM2.5; outlined: at twice the city's usual or more.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

Every city it reached

CityDaysHighestUsualAbove usual
Ban ChangRayong, Thailand10 110.024 March21.35.2×
Ban PhaeoSamut Sakhon, Thailand10 69.423 March16.44.2×
Samut SakhonSamut Sakhon, Thailand5 82.323 March19.94.1×
Nong KhaemBangkok, Thailand8 102.023 March25.34.0×
Prachin BuriPrachin Buri, Thailand4 85.624 March27.13.2×
AranyaprathetSa Kaeo, Thailand3 72.424 March23.03.1×
Ban Talat BuengChon Buri, Thailand9 64.424 March21.63.0×
Khlong LuangPathum Thani, Thailand4 80.124 March28.02.9×
PhetchaburiPhetchaburi, Thailand5 70.623 March24.02.9×
Nakhon PathomNakhon Pathom, Thailand6 68.623 March23.62.9×
BangkokBangkok, Thailand5 67.124 March23.12.9×
PakxanBolikhamsai, Laos3 125.024 March43.92.8×
Mueang NonthaburiNonthaburi, Thailand5 62.524 March22.62.8×
TratTrat, Thailand5 58.424 March20.92.8×
Samut PrakanSamut Prakan, Thailand4 54.624 March19.62.8×
ChanthaburiChanthaburi, Thailand6 52.924 March18.62.8×
RayongRayong, Thailand5 51.224 March18.52.8×
VientianeVientiane Prefecture, Laos4 154.024 March57.72.7×
Phra PradaengSamut Prakan, Thailand3 62.424 March22.92.7×
Laem ChabangChon Buri, Thailand3 50.423 March18.92.7×
ChumphonChumphon, Thailand7 40.023 March14.92.7×
LoeiLoei, Thailand3 132.026 March50.12.6×
Bang PakongChachoengsao, Thailand2 80.523 March31.22.6×
Si Maha PhotPrachin Buri, Thailand3 80.424 March31.12.6×
Bang KapiBangkok, Thailand2 61.624 March23.82.6×
Sakon NakhonSakon Nakhon, Thailand1 92.426 March36.92.5×
Nakhon LuangPhra Nakhon Si Ayutthaya, Thailand2 76.324 March30.52.5×
Buri RamBuriram, Thailand2 74.525 March29.32.5×
PhatthalungPhatthalung, Thailand2 32.526 March13.22.5×
Ubon RatchathaniUbon Ratchathani, Thailand2 133.026 March55.02.4×
Lop BuriLopburi, Thailand2 82.124 March34.42.4×
SurinSurin, Thailand4 73.625 March30.12.4×
SaraburiSaraburi, Thailand2 66.124 March27.22.4×
Bang Bo DistrictSamut Prakan, Thailand4 54.321 March22.22.4×
SukhothaiSukhothai, Thailand4 99.226 March43.22.3×
Nong Bua LamphuNong Bua Lamphu, Thailand5 88.725 March38.82.3×
Udon ThaniUdon Thani, Thailand3 86.725 March38.42.3×
ChaiyaphumChaiyaphum, Thailand2 84.225 March37.02.3×
Nakhon RatchasimaNakhon Ratchasima, Thailand2 77.724 March33.62.3×
Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand3 63.324 March27.32.3×
RanongRanong province, Thailand6 39.226 March17.42.3×
PhetchabunPhetchabun, Thailand2 81.924 March36.72.2×
Sing BuriSing Buri, Thailand1 81.824 March37.32.2×
Maha SarakhamMaha Sarakham, Thailand3 78.625 March36.42.2×
Nakhon NayokNakhon Nayok, Thailand3 51.725 March23.62.2×
Hua HinPrachuap Khiri Khan, Thailand3 45.322 March21.02.2×
Khon KaenKhon Kaen, Thailand2 91.625 March43.22.1×
YasothonYasothon, Thailand1 86.426 March41.92.1×
RatchaburiRatchaburi, Thailand2 67.824 March31.82.1×
KanchanaburiKanchanaburi, Thailand1 65.124 March31.72.1×
SadaoSongkhla, Thailand2 32.126 March15.12.1×
Roi EtRoi Et, Thailand1 87.225 March43.32.0×
PattaniPattani, Thailand1 28.526 March14.02.0×

Daily means in µg/m³, over the days each city counted in this episode. Highest: its highest of those days. Usual: the city's median for the time of year of that day (its days within 21 days of the date, every year, leaving out the week around it). Above usual: its highest day against that, with a usual under 5 µg/m³ taken as 5.

Against other episodes in Thailand and Laos

The largest of 23 episodes in Thailand and Laos since our records began, by cities reached.

Bars: cities reached; colour: the level of the episode's highest daily reading. All 23.

Use this page

SmogRank, Thailand and Laos, March 2025: 53 cities with PM2.5 at twice their usual or more, 20 to 29 March 2025, smogrank.com/episodes/2025-03-thailand-and-laos (accessed 4 October 2026).

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms.

An episode is a run of days when many cities close to each other (four or more within 350 km on a day, 8 or more in all) each had a daily PM2.5 mean of at least 25 µg/m³ and at least 2 times their usual for that time of year. Found in our own measurements, not picked by hand. How we find episodes. Values are each city's daily mean of its own monitors; causes are the usual kinds for a pattern like this, not a confirmed source.