SmogRank / Episodes / Thailand

Northern Thailand, January 2025

For 4 days, from 23 to 26 January 2025, 51 cities in Thailand had PM2.5 at least twice their usual for the time of year. The worst reading was Khlong Luang, Pathum Thani, Thailand: 117.0 µg/m³ on 24 January, about 2.7× its usual 42.8. Readings from most of its cities stopped after 26 January, so this episode may have run longer.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached51in 1 country
Days423 to 26 January 2025
Worst day24 January46 cities counted
Furthest above usual3.4×Si Sa Ket

Day by day

24 January 46 cities at twice their usual or more
Nakhon RatchasimaAranyaprathetPrachin BuriSaphan SungSuphan BuriNakhon SawanPhichitLoeiNakhon PathomBan PhaeoTratRatchaburiKanchanaburiKamphaeng PhetHua HinUttaraditMae SotPhetchabunBan Thai TanChanthaburiSamut PrakanMaha SarakhamLaem ChabangBang Bo DistrictBan Samae DamMueang NonthaburiRayongSurinKhon KaenLat KrabangPhetchaburiSing BuriNakhon NayokBan Talat BuengSaraburiBangkokKhlong Sam WaSamut SakhonPhra PradaengSukhothaiSai MaiLak SiAmnat CharoenMukdahanNong Bua LamphuKalasinPhra Nakhon Si AyutthayaSi Maha PhotBang NaNong KhaemNakhon LuangSakon NakhonBan ChangBan Khlong PrawetLop BuriBang KapiChai NatKhan Na YaoNong ChokBueng KumKhlong LuangUdon ThaniBuri RamUbon RatchathaniChaiyaphumRoi EtYasothonSi Sa Ket
20 Jan212223242526272829
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

Nong KhaemNong Khaem, 20 January: 66.2 µg/m³Nong Khaem, 21 January: 78.3 µg/m³Nong Khaem, 22 January: 80.7 µg/m³Nong Khaem, 23 January: 91.8 µg/m³, 2.2× its usual 42.0Nong Khaem, 24 January: 103.8 µg/m³, 2.5× its usual 42.1Nong Khaem, 25 January: 79.0 µg/m³Nong Khaem, 26 January: 53.4 µg/m³Nong Khaem, 27 January: 36.3 µg/m³Nong Khaem, 28 January: 29.2 µg/m³Nong Khaem, 29 January: 39.0 µg/m³Bang NaBang Na, 20 January: 51.2 µg/m³Bang Na, 21 January: 61.9 µg/m³Bang Na, 22 January: 73.9 µg/m³Bang Na, 23 January: 86.3 µg/m³, 2.2× its usual 39.6Bang Na, 24 January: 101.0 µg/m³, 2.5× its usual 40.0Bang Na, 25 January: 82.9 µg/m³, 2.1× its usual 39.6Bang Na, 26 January: 58.7 µg/m³Bang Na, 27 January: 40.4 µg/m³Bang Na, 28 January: 26.6 µg/m³Bang Na, 29 January: 32.2 µg/m³Bueng KumBueng Kum, 20 January: 58.5 µg/m³Bueng Kum, 21 January: 66.7 µg/m³Bueng Kum, 22 January: 73.4 µg/m³Bueng Kum, 23 January: 84.7 µg/m³, 2.1× its usual 39.7Bueng Kum, 24 January: 107.0 µg/m³, 2.7× its usual 39.7Bueng Kum, 25 January: 89.0 µg/m³, 2.2× its usual 39.6Bueng Kum, 26 January: 60.6 µg/m³Bueng Kum, 27 January: 37.5 µg/m³Bueng Kum, 28 January: 28.3 µg/m³Bueng Kum, 29 January: 34.8 µg/m³Khan Na YaoKhan Na Yao, 20 January: 59.1 µg/m³Khan Na Yao, 21 January: 69.8 µg/m³Khan Na Yao, 22 January: 68.7 µg/m³Khan Na Yao, 23 January: 83.5 µg/m³, 2.1× its usual 39.6Khan Na Yao, 24 January: 104.0 µg/m³, 2.6× its usual 39.5Khan Na Yao, 25 January: 91.3 µg/m³, 2.3× its usual 39.3Khan Na Yao, 26 January: 63.9 µg/m³Khan Na Yao, 27 January: 38.7 µg/m³Khan Na Yao, 28 January: 25.9 µg/m³Khan Na Yao, 29 January: 32.5 µg/m³Nong ChokNong Chok, 20 January: 59.8 µg/m³Nong Chok, 21 January: 60.2 µg/m³Nong Chok, 22 January: 66.0 µg/m³Nong Chok, 23 January: 81.8 µg/m³, 2.3× its usual 36.2Nong Chok, 24 January: 98.8 µg/m³, 2.7× its usual 36.0Nong Chok, 25 January: 93.6 µg/m³, 2.6× its usual 35.6Nong Chok, 26 January: 73.2 µg/m³, 2.0× its usual 36.0Nong Chok, 27 January: 37.4 µg/m³Nong Chok, 28 January: 23.3 µg/m³Nong Chok, 29 January: 30.4 µg/m³Ban Samae DamBan Samae Dam, 20 January: 55.2 µg/m³Ban Samae Dam, 21 January: 70.9 µg/m³Ban Samae Dam, 22 January: 79.1 µg/m³Ban Samae Dam, 23 January: 79.9 µg/m³, 2.1× its usual 37.6Ban Samae Dam, 24 January: 79.8 µg/m³, 2.1× its usual 37.5Ban Samae Dam, 25 January: 61.7 µg/m³Ban Samae Dam, 26 January: 46.8 µg/m³Ban Samae Dam, 27 January: 36.0 µg/m³Ban Samae Dam, 28 January: 28.6 µg/m³Ban Samae Dam, 29 January: 33.8 µg/m³Bang KapiBang Kapi, 20 January: 57.2 µg/m³Bang Kapi, 21 January: 63.5 µg/m³Bang Kapi, 22 January: 62.0 µg/m³Bang Kapi, 23 January: 77.3 µg/m³, 2.1× its usual 36.8Bang Kapi, 24 January: 94.5 µg/m³, 2.6× its usual 36.7Bang Kapi, 25 January: 79.9 µg/m³, 2.2× its usual 36.6Bang Kapi, 26 January: 57.6 µg/m³Bang Kapi, 27 January: 37.6 µg/m³Bang Kapi, 28 January: 25.9 µg/m³Bang Kapi, 29 January: 31.3 µg/m³Ban Khlong PrawetBan Khlong Prawet, 20 January: 53.5 µg/m³Ban Khlong Prawet, 21 January: 60.2 µg/m³Ban Khlong Prawet, 22 January: 61.1 µg/m³Ban Khlong Prawet, 23 January: 74.3 µg/m³, 2.2× its usual 33.7Ban Khlong Prawet, 24 January: 88.1 µg/m³, 2.6× its usual 33.8Ban Khlong Prawet, 25 January: 74.0 µg/m³, 2.2× its usual 33.7Ban Khlong Prawet, 26 January: 51.5 µg/m³Ban Khlong Prawet, 27 January: 32.6 µg/m³Ban Khlong Prawet, 28 January: 24.2 µg/m³Ban Khlong Prawet, 29 January: 33.4 µg/m³BangkokBangkok, 20 January: 51.4 µg/m³Bangkok, 21 January: 59.0 µg/m³Bangkok, 22 January: 64.3 µg/m³Bangkok, 23 January: 73.3 µg/m³, 2.1× its usual 34.7Bangkok, 24 January: 81.4 µg/m³, 2.3× its usual 34.7Bangkok, 25 January: 64.7 µg/m³Bangkok, 26 January: 48.2 µg/m³Bangkok, 27 January: 33.7 µg/m³Bangkok, 28 January: 27.6 µg/m³Bangkok, 29 January: 31.1 µg/m³Khlong LuangKhlong Luang, 20 January: no readingKhlong Luang, 21 January: no readingKhlong Luang, 22 January: no readingKhlong Luang, 23 January: no readingKhlong Luang, 24 January: 117.0 µg/m³, 2.7× its usual 42.8Khlong Luang, 25 January: 104.0 µg/m³, 2.4× its usual 42.9Khlong Luang, 26 January: 65.1 µg/m³Khlong Luang, 27 January: no readingKhlong Luang, 28 January: no readingKhlong Luang, 29 January: no readingNakhon LuangNakhon Luang, 20 January: no readingNakhon Luang, 21 January: no readingNakhon Luang, 22 January: no readingNakhon Luang, 23 January: no readingNakhon Luang, 24 January: 115.0 µg/m³, 2.5× its usual 45.2Nakhon Luang, 25 January: 99.9 µg/m³, 2.2× its usual 45.2Nakhon Luang, 26 January: 69.0 µg/m³Nakhon Luang, 27 January: no readingNakhon Luang, 28 January: no readingNakhon Luang, 29 January: no readingSamut SakhonSamut Sakhon, 20 January: no readingSamut Sakhon, 21 January: no readingSamut Sakhon, 22 January: no readingSamut Sakhon, 23 January: no readingSamut Sakhon, 24 January: 102.0 µg/m³, 2.3× its usual 44.0Samut Sakhon, 25 January: 68.4 µg/m³Samut Sakhon, 26 January: 36.5 µg/m³Samut Sakhon, 27 January: no readingSamut Sakhon, 28 January: no readingSamut Sakhon, 29 January: no readingKhlong Sam WaKhlong Sam Wa, 20 January: 66.8 µg/m³Khlong Sam Wa, 21 January: 69.3 µg/m³Khlong Sam Wa, 22 January: 65.2 µg/m³Khlong Sam Wa, 23 January: 81.1 µg/m³Khlong Sam Wa, 24 January: 101.0 µg/m³, 2.3× its usual 44.4Khlong Sam Wa, 25 January: 87.7 µg/m³, 2.0× its usual 43.7Khlong Sam Wa, 26 January: 64.6 µg/m³Khlong Sam Wa, 27 January: 38.8 µg/m³Khlong Sam Wa, 28 January: 32.6 µg/m³Khlong Sam Wa, 29 January: 38.7 µg/m³Chai NatChai Nat, 20 January: no readingChai Nat, 21 January: no readingChai Nat, 22 January: no readingChai Nat, 23 January: no readingChai Nat, 24 January: 99.8 µg/m³, 2.6× its usual 39.1Chai Nat, 25 January: 97.4 µg/m³, 2.5× its usual 39.3Chai Nat, 26 January: 71.2 µg/m³Chai Nat, 27 January: no readingChai Nat, 28 January: no readingChai Nat, 29 January: no readingSing BuriSing Buri, 20 January: no readingSing Buri, 21 January: no readingSing Buri, 22 January: no readingSing Buri, 23 January: no readingSing Buri, 24 January: 97.3 µg/m³, 2.2× its usual 44.7Sing Buri, 25 January: 98.5 µg/m³, 2.2× its usual 44.7Sing Buri, 26 January: 79.0 µg/m³Sing Buri, 27 January: no readingSing Buri, 28 January: no readingSing Buri, 29 January: no readingPhetchaburiPhetchaburi, 20 January: no readingPhetchaburi, 21 January: no readingPhetchaburi, 22 January: no readingPhetchaburi, 23 January: no readingPhetchaburi, 24 January: 95.6 µg/m³, 2.2× its usual 42.6Phetchaburi, 25 January: 83.4 µg/m³Phetchaburi, 26 January: 47.7 µg/m³Phetchaburi, 27 January: no readingPhetchaburi, 28 January: no readingPhetchaburi, 29 January: no readingBan Thai TanBan Thai Tan, 20 January: no readingBan Thai Tan, 21 January: no readingBan Thai Tan, 22 January: no readingBan Thai Tan, 23 January: no readingBan Thai Tan, 24 January: 92.8 µg/m³, 2.0× its usual 45.5Ban Thai Tan, 25 January: 83.1 µg/m³Ban Thai Tan, 26 January: 56.8 µg/m³Ban Thai Tan, 27 January: no readingBan Thai Tan, 28 January: no readingBan Thai Tan, 29 January: no readingLak SiLak Si, 20 January: 57.6 µg/m³Lak Si, 21 January: 63.5 µg/m³Lak Si, 22 January: 60.9 µg/m³Lak Si, 23 January: 71.1 µg/m³Lak Si, 24 January: 92.4 µg/m³, 2.4× its usual 37.8Lak Si, 25 January: 75.9 µg/m³, 2.0× its usual 37.8Lak Si, 26 January: 54.1 µg/m³Lak Si, 27 January: 33.8 µg/m³Lak Si, 28 January: 31.9 µg/m³Lak Si, 29 January: 36.6 µg/m³Lop BuriLop Buri, 20 January: no readingLop Buri, 21 January: no readingLop Buri, 22 January: no readingLop Buri, 23 January: no readingLop Buri, 24 January: 92.1 µg/m³, 2.6× its usual 35.3Lop Buri, 25 January: 93.8 µg/m³, 2.6× its usual 36.3Lop Buri, 26 January: 82.1 µg/m³, 2.2× its usual 37.1Lop Buri, 27 January: no readingLop Buri, 28 January: no readingLop Buri, 29 January: no readingLat KrabangLat Krabang, 20 January: 59.3 µg/m³Lat Krabang, 21 January: 66.6 µg/m³Lat Krabang, 22 January: 68.4 µg/m³Lat Krabang, 23 January: 78.4 µg/m³Lat Krabang, 24 January: 89.4 µg/m³, 2.2× its usual 40.7Lat Krabang, 25 January: 83.7 µg/m³, 2.1× its usual 40.3Lat Krabang, 26 January: 61.2 µg/m³Lat Krabang, 27 January: 38.6 µg/m³Lat Krabang, 28 January: 30.8 µg/m³Lat Krabang, 29 January: 37.4 µg/m³Si Maha PhotSi Maha Phot, 20 January: no readingSi Maha Phot, 21 January: no readingSi Maha Phot, 22 January: no readingSi Maha Phot, 23 January: no readingSi Maha Phot, 24 January: 87.8 µg/m³, 2.3× its usual 38.7Si Maha Phot, 25 January: 96.5 µg/m³, 2.5× its usual 38.7Si Maha Phot, 26 January: 77.3 µg/m³Si Maha Phot, 27 January: no readingSi Maha Phot, 28 January: no readingSi Maha Phot, 29 January: no readingSai MaiSai Mai, 20 January: 54.6 µg/m³Sai Mai, 21 January: 59.0 µg/m³Sai Mai, 22 January: 57.6 µg/m³Sai Mai, 23 January: 69.1 µg/m³Sai Mai, 24 January: 87.3 µg/m³, 2.4× its usual 36.1Sai Mai, 25 January: 69.8 µg/m³Sai Mai, 26 January: 52.5 µg/m³Sai Mai, 27 January: 32.1 µg/m³Sai Mai, 28 January: 26.3 µg/m³Sai Mai, 29 January: 31.1 µg/m³Phra Nakhon Si Ayut…Phra Nakhon Si Ayutthaya, 20 January: no readingPhra Nakhon Si Ayutthaya, 21 January: no readingPhra Nakhon Si Ayutthaya, 22 January: no readingPhra Nakhon Si Ayutthaya, 23 January: no readingPhra Nakhon Si Ayutthaya, 24 January: 86.4 µg/m³, 2.5× its usual 34.5Phra Nakhon Si Ayutthaya, 25 January: 66.8 µg/m³Phra Nakhon Si Ayutthaya, 26 January: 52.6 µg/m³Phra Nakhon Si Ayutthaya, 27 January: no readingPhra Nakhon Si Ayutthaya, 28 January: no readingPhra Nakhon Si Ayutthaya, 29 January: no readingSukhothaiSukhothai, 20 January: no readingSukhothai, 21 January: no readingSukhothai, 22 January: no readingSukhothai, 23 January: no readingSukhothai, 24 January: 84.1 µg/m³, 2.4× its usual 35.4Sukhothai, 25 January: 84.4 µg/m³, 2.4× its usual 35.5Sukhothai, 26 January: 86.5 µg/m³, 2.4× its usual 35.6Sukhothai, 27 January: no readingSukhothai, 28 January: no readingSukhothai, 29 January: no readingMueang NonthaburiMueang Nonthaburi, 20 January: 51.2 µg/m³Mueang Nonthaburi, 21 January: 55.5 µg/m³Mueang Nonthaburi, 22 January: no readingMueang Nonthaburi, 23 January: 71.0 µg/m³Mueang Nonthaburi, 24 January: 83.4 µg/m³, 2.1× its usual 39.0Mueang Nonthaburi, 25 January: 62.4 µg/m³Mueang Nonthaburi, 26 January: 45.3 µg/m³Mueang Nonthaburi, 27 January: 29.2 µg/m³Mueang Nonthaburi, 28 January: 26.2 µg/m³Mueang Nonthaburi, 29 January: 30.1 µg/m³Ban ChangBan Chang, 20 January: no readingBan Chang, 21 January: no readingBan Chang, 22 January: no readingBan Chang, 23 January: no readingBan Chang, 24 January: 82.8 µg/m³, 2.6× its usual 31.3Ban Chang, 25 January: 72.5 µg/m³, 2.3× its usual 31.3Ban Chang, 26 January: 46.2 µg/m³Ban Chang, 27 January: no readingBan Chang, 28 January: no readingBan Chang, 29 January: no readingPhra PradaengPhra Pradaeng, 20 January: no readingPhra Pradaeng, 21 January: no readingPhra Pradaeng, 22 January: no readingPhra Pradaeng, 23 January: no readingPhra Pradaeng, 24 January: 81.6 µg/m³, 2.4× its usual 33.7Phra Pradaeng, 25 January: 67.5 µg/m³, 2.0× its usual 33.7Phra Pradaeng, 26 January: 47.1 µg/m³Phra Pradaeng, 27 January: no readingPhra Pradaeng, 28 January: no readingPhra Pradaeng, 29 January: no readingSaraburiSaraburi, 20 January: no readingSaraburi, 21 January: no readingSaraburi, 22 January: no readingSaraburi, 23 January: no readingSaraburi, 24 January: 80.5 µg/m³, 2.3× its usual 34.4Saraburi, 25 January: 68.1 µg/m³Saraburi, 26 January: 50.5 µg/m³Saraburi, 27 January: no readingSaraburi, 28 January: no readingSaraburi, 29 January: no readingBan Talat BuengBan Talat Bueng, 20 January: no readingBan Talat Bueng, 21 January: no readingBan Talat Bueng, 22 January: no readingBan Talat Bueng, 23 January: no readingBan Talat Bueng, 24 January: 76.2 µg/m³, 2.3× its usual 33.7Ban Talat Bueng, 25 January: 68.4 µg/m³, 2.0× its usual 34.1Ban Talat Bueng, 26 January: no readingBan Talat Bueng, 27 January: no readingBan Talat Bueng, 28 January: no readingBan Talat Bueng, 29 January: no readingKalasinKalasin, 20 January: no readingKalasin, 21 January: no readingKalasin, 22 January: no readingKalasin, 23 January: no readingKalasin, 24 January: 75.5 µg/m³, 2.5× its usual 30.8Kalasin, 25 January: 78.9 µg/m³, 2.5× its usual 31.0Kalasin, 26 January: 77.0 µg/m³, 2.5× its usual 31.3Kalasin, 27 January: no readingKalasin, 28 January: no readingKalasin, 29 January: no readingKhon KaenKhon Kaen, 20 January: no readingKhon Kaen, 21 January: no readingKhon Kaen, 22 January: no readingKhon Kaen, 23 January: no readingKhon Kaen, 24 January: 72.5 µg/m³, 2.1× its usual 34.4Khon Kaen, 25 January: 69.8 µg/m³Khon Kaen, 26 January: 79.7 µg/m³, 2.2× its usual 35.7Khon Kaen, 27 January: no readingKhon Kaen, 28 January: no readingKhon Kaen, 29 January: no readingLaem ChabangLaem Chabang, 20 January: no readingLaem Chabang, 21 January: no readingLaem Chabang, 22 January: no readingLaem Chabang, 23 January: no readingLaem Chabang, 24 January: 68.1 µg/m³, 2.1× its usual 31.9Laem Chabang, 25 January: 63.9 µg/m³, 2.0× its usual 31.9Laem Chabang, 26 January: 40.2 µg/m³Laem Chabang, 27 January: no readingLaem Chabang, 28 January: no readingLaem Chabang, 29 January: no readingYasothonYasothon, 20 January: no readingYasothon, 21 January: no readingYasothon, 22 January: no readingYasothon, 23 January: no readingYasothon, 24 January: 64.2 µg/m³, 2.3× its usual 27.7Yasothon, 25 January: 82.9 µg/m³, 3.0× its usual 27.4Yasothon, 26 January: 68.0 µg/m³, 2.4× its usual 27.8Yasothon, 27 January: no readingYasothon, 28 January: no readingYasothon, 29 January: no readingUbon RatchathaniUbon Ratchathani, 20 January: no readingUbon Ratchathani, 21 January: no readingUbon Ratchathani, 22 January: no readingUbon Ratchathani, 23 January: no readingUbon Ratchathani, 24 January: 63.1 µg/m³, 2.3× its usual 27.1Ubon Ratchathani, 25 January: 77.3 µg/m³, 2.8× its usual 27.2Ubon Ratchathani, 26 January: 64.5 µg/m³, 2.3× its usual 27.5Ubon Ratchathani, 27 January: no readingUbon Ratchathani, 28 January: no readingUbon Ratchathani, 29 January: no readingChaiyaphumChaiyaphum, 20 January: no readingChaiyaphum, 21 January: no readingChaiyaphum, 22 January: no readingChaiyaphum, 23 January: no readingChaiyaphum, 24 January: 62.9 µg/m³, 2.4× its usual 26.0Chaiyaphum, 25 January: 78.0 µg/m³, 2.9× its usual 26.8Chaiyaphum, 26 January: no readingChaiyaphum, 27 January: no readingChaiyaphum, 28 January: no readingChaiyaphum, 29 January: no readingRayongRayong, 20 January: no readingRayong, 21 January: no readingRayong, 22 January: no readingRayong, 23 January: no readingRayong, 24 January: 62.5 µg/m³, 2.2× its usual 28.4Rayong, 25 January: 62.8 µg/m³, 2.2× its usual 28.3Rayong, 26 January: 43.1 µg/m³Rayong, 27 January: no readingRayong, 28 January: no readingRayong, 29 January: no readingUdon ThaniUdon Thani, 20 January: no readingUdon Thani, 21 January: no readingUdon Thani, 22 January: no readingUdon Thani, 23 January: no readingUdon Thani, 24 January: 60.8 µg/m³, 2.6× its usual 23.5Udon Thani, 25 January: 68.4 µg/m³, 2.8× its usual 24.1Udon Thani, 26 January: 57.1 µg/m³, 2.3× its usual 24.9Udon Thani, 27 January: no readingUdon Thani, 28 January: no readingUdon Thani, 29 January: no readingSamut PrakanSamut Prakan, 20 January: no readingSamut Prakan, 21 January: no readingSamut Prakan, 22 January: no readingSamut Prakan, 23 January: no readingSamut Prakan, 24 January: 60.2 µg/m³, 2.1× its usual 28.9Samut Prakan, 25 January: 50.4 µg/m³Samut Prakan, 26 January: 34.4 µg/m³Samut Prakan, 27 January: no readingSamut Prakan, 28 January: no readingSamut Prakan, 29 January: no readingNong Bua LamphuNong Bua Lamphu, 20 January: no readingNong Bua Lamphu, 21 January: no readingNong Bua Lamphu, 22 January: no readingNong Bua Lamphu, 23 January: no readingNong Bua Lamphu, 24 January: 60.1 µg/m³, 2.4× its usual 24.6Nong Bua Lamphu, 25 January: 59.6 µg/m³, 2.3× its usual 25.5Nong Bua Lamphu, 26 January: 63.2 µg/m³, 2.5× its usual 25.7Nong Bua Lamphu, 27 January: no readingNong Bua Lamphu, 28 January: no readingNong Bua Lamphu, 29 January: no readingSi Sa KetSi Sa Ket, 20 January: no readingSi Sa Ket, 21 January: no readingSi Sa Ket, 22 January: no readingSi Sa Ket, 23 January: no readingSi Sa Ket, 24 January: 59.4 µg/m³, 2.8× its usual 21.5Si Sa Ket, 25 January: no readingSi Sa Ket, 26 January: 75.6 µg/m³, 3.4× its usual 22.2Si Sa Ket, 27 January: no readingSi Sa Ket, 28 January: no readingSi Sa Ket, 29 January: no readingNakhon NayokNakhon Nayok, 20 January: no readingNakhon Nayok, 21 January: no readingNakhon Nayok, 22 January: no readingNakhon Nayok, 23 January: no readingNakhon Nayok, 24 January: 56.8 µg/m³, 2.3× its usual 25.2Nakhon Nayok, 25 January: 44.8 µg/m³Nakhon Nayok, 26 January: 41.5 µg/m³Nakhon Nayok, 27 January: no readingNakhon Nayok, 28 January: no readingNakhon Nayok, 29 January: no readingRoi EtRoi Et, 20 January: no readingRoi Et, 21 January: no readingRoi Et, 22 January: no readingRoi Et, 23 January: no readingRoi Et, 24 January: 56.5 µg/m³, 2.5× its usual 22.5Roi Et, 25 January: 67.5 µg/m³, 3.0× its usual 22.7Roi Et, 26 January: 64.0 µg/m³, 2.8× its usual 22.9Roi Et, 27 January: no readingRoi Et, 28 January: no readingRoi Et, 29 January: no readingChanthaburiChanthaburi, 20 January: no readingChanthaburi, 21 January: no readingChanthaburi, 22 January: no readingChanthaburi, 23 January: no readingChanthaburi, 24 January: 55.6 µg/m³, 2.1× its usual 26.1Chanthaburi, 25 January: 56.0 µg/m³, 2.1× its usual 26.1Chanthaburi, 26 January: 48.6 µg/m³Chanthaburi, 27 January: no readingChanthaburi, 28 January: no readingChanthaburi, 29 January: no readingBuri RamBuri Ram, 20 January: no readingBuri Ram, 21 January: no readingBuri Ram, 22 January: no readingBuri Ram, 23 January: no readingBuri Ram, 24 January: 52.7 µg/m³, 2.1× its usual 24.6Buri Ram, 25 January: 67.7 µg/m³, 2.7× its usual 25.1Buri Ram, 26 January: 71.8 µg/m³, 2.8× its usual 25.4Buri Ram, 27 January: no readingBuri Ram, 28 January: no readingBuri Ram, 29 January: no readingMukdahanMukdahan, 20 January: no readingMukdahan, 21 January: no readingMukdahan, 22 January: no readingMukdahan, 23 January: no readingMukdahan, 24 January: 50.0 µg/m³, 2.0× its usual 24.4Mukdahan, 25 January: 62.3 µg/m³, 2.5× its usual 25.1Mukdahan, 26 January: 44.8 µg/m³Mukdahan, 27 January: no readingMukdahan, 28 January: no readingMukdahan, 29 January: no readingSakon NakhonSakon Nakhon, 20 January: no readingSakon Nakhon, 21 January: no readingSakon Nakhon, 22 January: no readingSakon Nakhon, 23 January: no readingSakon Nakhon, 24 January: 37.0 µg/m³, 2.1× its usual 17.5Sakon Nakhon, 25 January: 47.7 µg/m³, 2.6× its usual 18.2Sakon Nakhon, 26 January: 42.5 µg/m³, 2.3× its usual 18.5Sakon Nakhon, 27 January: no readingSakon Nakhon, 28 January: no readingSakon Nakhon, 29 January: no readingBang Bo DistrictBang Bo District, 20 January: no readingBang Bo District, 21 January: no readingBang Bo District, 22 January: no readingBang Bo District, 23 January: no readingBang Bo District, 24 January: no readingBang Bo District, 25 January: 70.1 µg/m³, 2.1× its usual 33.8Bang Bo District, 26 January: 40.3 µg/m³Bang Bo District, 27 January: no readingBang Bo District, 28 January: no readingBang Bo District, 29 January: no readingSurinSurin, 20 January: no readingSurin, 21 January: no readingSurin, 22 January: no readingSurin, 23 January: no readingSurin, 24 January: 55.3 µg/m³Surin, 25 January: 67.1 µg/m³, 2.2× its usual 31.2Surin, 26 January: 66.4 µg/m³, 2.1× its usual 31.8Surin, 27 January: no readingSurin, 28 January: no readingSurin, 29 January: no readingMaha SarakhamMaha Sarakham, 20 January: no readingMaha Sarakham, 21 January: no readingMaha Sarakham, 22 January: no readingMaha Sarakham, 23 January: no readingMaha Sarakham, 24 January: 57.8 µg/m³Maha Sarakham, 25 January: 61.7 µg/m³, 2.0× its usual 30.3Maha Sarakham, 26 January: 64.5 µg/m³, 2.1× its usual 31.3Maha Sarakham, 27 January: no readingMaha Sarakham, 28 January: no readingMaha Sarakham, 29 January: no readingAmnat CharoenAmnat Charoen, 20 January: no readingAmnat Charoen, 21 January: no readingAmnat Charoen, 22 January: no readingAmnat Charoen, 23 January: no readingAmnat Charoen, 24 January: 43.8 µg/m³Amnat Charoen, 25 January: 58.4 µg/m³, 2.5× its usual 23.2Amnat Charoen, 26 January: 43.8 µg/m³Amnat Charoen, 27 January: no readingAmnat Charoen, 28 January: no readingAmnat Charoen, 29 January: no readingPhetchabunPhetchabun, 20 January: no readingPhetchabun, 21 January: no readingPhetchabun, 22 January: no readingPhetchabun, 23 January: no readingPhetchabun, 24 January: 58.0 µg/m³Phetchabun, 25 January: 58.9 µg/m³Phetchabun, 26 January: 64.3 µg/m³, 2.0× its usual 31.9Phetchabun, 27 January: no readingPhetchabun, 28 January: no readingPhetchabun, 29 January: no reading20 Jan212223242526272829
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
Si Sa KetSi Sa Ket, Thailand2 75.626 January22.23.4×
YasothonYasothon, Thailand3 82.925 January27.43.0×
Roi EtRoi Et, Thailand3 67.525 January22.73.0×
ChaiyaphumChaiyaphum, Thailand2 78.025 January26.82.9×
Ubon RatchathaniUbon Ratchathani, Thailand3 77.325 January27.22.8×
Buri RamBuriram, Thailand3 71.826 January25.42.8×
Udon ThaniUdon Thani, Thailand3 68.425 January24.12.8×
Khlong LuangPathum Thani, Thailand2 117.024 January42.82.7×
Bueng KumBangkok, Thailand3 107.024 January39.72.7×
Nong ChokBangkok, Thailand4 98.824 January36.02.7×
Khan Na YaoBangkok, Thailand3 104.024 January39.52.6×
Chai NatChai Nat, Thailand2 99.824 January39.12.6×
Bang KapiBangkok, Thailand3 94.524 January36.72.6×
Lop BuriLopburi, Thailand3 93.825 January36.32.6×
Ban Khlong PrawetBangkok, Thailand3 88.124 January33.82.6×
Ban ChangRayong, Thailand2 82.824 January31.32.6×
Sakon NakhonSakon Nakhon, Thailand3 47.725 January18.22.6×
Nakhon LuangPhra Nakhon Si Ayutthaya, Thailand2 115.024 January45.22.5×
Nong KhaemBangkok, Thailand2 103.824 January42.12.5×
Bang NaBangkok, Thailand3 101.024 January40.02.5×
Si Maha PhotPrachin Buri, Thailand2 96.525 January38.72.5×
Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand1 86.424 January34.52.5×
KalasinKalasin, Thailand3 78.925 January31.02.5×
Nong Bua LamphuNong Bua Lamphu, Thailand3 63.226 January25.72.5×
MukdahanMukdahan, Thailand2 62.325 January25.12.5×
Amnat CharoenAmnat Charoen, Thailand1 58.425 January23.22.5×
Lak SiBangkok, Thailand2 92.424 January37.82.4×
Sai MaiBangkok, Thailand1 87.324 January36.12.4×
SukhothaiSukhothai, Thailand3 86.526 January35.62.4×
Phra PradaengSamut Prakan, Thailand2 81.624 January33.72.4×
Samut SakhonSamut Sakhon, Thailand1 102.024 January44.02.3×
Khlong Sam WaBangkok, Thailand2 101.024 January44.42.3×
BangkokBangkok, Thailand2 81.424 January34.72.3×
SaraburiSaraburi, Thailand1 80.524 January34.42.3×
Ban Talat BuengChon Buri, Thailand2 76.224 January33.72.3×
Nakhon NayokNakhon Nayok, Thailand1 56.824 January25.22.3×
Sing BuriSing Buri, Thailand2 98.525 January44.72.2×
PhetchaburiPhetchaburi, Thailand1 95.624 January42.62.2×
Lat KrabangBangkok, Thailand2 89.424 January40.72.2×
Khon KaenKhon Kaen, Thailand2 79.726 January35.72.2×
SurinSurin, Thailand2 67.125 January31.22.2×
RayongRayong, Thailand2 62.825 January28.32.2×
Mueang NonthaburiNonthaburi, Thailand1 83.424 January39.02.1×
Ban Samae DamBangkok, Thailand2 79.923 January37.62.1×
Bang Bo DistrictSamut Prakan, Thailand1 70.125 January33.82.1×
Laem ChabangChon Buri, Thailand2 68.124 January31.92.1×
Maha SarakhamMaha Sarakham, Thailand2 64.526 January31.32.1×
Samut PrakanSamut Prakan, Thailand1 60.224 January28.92.1×
ChanthaburiChanthaburi, Thailand2 56.025 January26.12.1×
Ban Thai TanAng Thong, Thailand1 92.824 January45.52.0×
PhetchabunPhetchabun, Thailand1 64.326 January31.92.0×

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

Number 3 of 24 episodes in Thailand since our records began, by cities reached.

Bars: cities reached; colour: the level of the episode's highest daily reading. All 24.

Use this page

SmogRank, Northern Thailand, January 2025: 51 cities with PM2.5 at twice their usual or more, 23 to 26 January 2025, smogrank.com/episodes/2025-01-northern-thailand (accessed 5 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.