SmogRank / Episodes / Thailand

Central Thailand, January 2025

For 4 days, from 23 to 26 January 2025, 50 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.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached50in 1 country
Days423 to 26 January 2025
Worst day24 January45 cities counted
Furthest above usual3.4×Si Sa Ket

Day by day

24 January 45 cities at twice their usual or more
Nakhon RatchasimaAranyaprathetPrachin BuriSaphan SungSuphan BuriNakhon SawanPhichitLoeiNakhon PathomBan PhaeoTratRatchaburiKanchanaburiKamphaeng PhetHua HinUttaraditMae SotPhetchabunBang Bo DistrictMaha SarakhamLaem ChabangChanthaburiMueang NonthaburiSamut PrakanBan Samae DamSurinLat KrabangKhon KaenRayongSing BuriPhetchaburiKhlong Sam WaBan Talat BuengNakhon NayokSamut SakhonSaraburiBangkokSai MaiLak SiPhra PradaengSukhothaiAmnat CharoenKalasinMukdahanNakhon LuangNong Bua LamphuPhra Nakhon Si AyutthayaSi Maha PhotBang NaNong KhaemBan ChangChai NatLop BuriSakon NakhonKhan Na YaoBang KapiBan Khlong PrawetKhlong LuangBueng KumNong ChokBuri RamUbon RatchathaniUdon ThaniChaiyaphumRoi 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

Ban Samae DamBan Samae Dam, 20 January: 55.2 µg/m³, 1.5× usualBan Samae Dam, 21 January: 70.9 µg/m³, 1.9× usualBan Samae Dam, 22 January: 79.1 µg/m³, 2.1× usualBan Samae Dam, 23 January: 79.9 µg/m³, 2.1× usualBan Samae Dam, 24 January: 79.8 µg/m³, 2.1× usualBan Samae Dam, 25 January: 61.7 µg/m³, 1.6× usualBan Samae Dam, 26 January: 46.8 µg/m³, 1.2× usualBan Samae Dam, 27 January: 36.0 µg/m³, 1.0× usualBan Samae Dam, 28 January: 28.6 µg/m³, 0.8× usualBan Samae Dam, 29 January: 33.8 µg/m³, 0.9× usualNong KhaemNong Khaem, 20 January: 66.2 µg/m³, 1.6× usualNong Khaem, 21 January: 78.3 µg/m³, 1.9× usualNong Khaem, 22 January: 80.7 µg/m³, 1.9× usualNong Khaem, 23 January: 91.8 µg/m³, 2.2× usualNong Khaem, 24 January: 103.8 µg/m³, 2.5× usualNong Khaem, 25 January: 79.0 µg/m³, 1.9× usualNong Khaem, 26 January: 53.4 µg/m³, 1.3× usualNong Khaem, 27 January: 36.3 µg/m³, 0.9× usualNong Khaem, 28 January: 29.2 µg/m³, 0.7× usualNong Khaem, 29 January: 39.0 µg/m³, 0.9× usualBang NaBang Na, 20 January: 51.2 µg/m³, 1.3× usualBang Na, 21 January: 61.9 µg/m³, 1.5× usualBang Na, 22 January: 73.9 µg/m³, 1.8× usualBang Na, 23 January: 86.3 µg/m³, 2.2× usualBang Na, 24 January: 101.0 µg/m³, 2.5× usualBang Na, 25 January: 82.9 µg/m³, 2.1× usualBang Na, 26 January: 58.7 µg/m³, 1.5× usualBang Na, 27 January: 40.4 µg/m³, 1.0× usualBang Na, 28 January: 26.6 µg/m³, 0.7× usualBang Na, 29 January: 32.2 µg/m³, 0.8× usualBueng KumBueng Kum, 20 January: 58.5 µg/m³, 1.5× usualBueng Kum, 21 January: 66.7 µg/m³, 1.7× usualBueng Kum, 22 January: 73.4 µg/m³, 1.8× usualBueng Kum, 23 January: 84.7 µg/m³, 2.1× usualBueng Kum, 24 January: 107.0 µg/m³, 2.7× usualBueng Kum, 25 January: 89.0 µg/m³, 2.2× usualBueng Kum, 26 January: 60.6 µg/m³, 1.5× usualBueng Kum, 27 January: 37.5 µg/m³, 0.9× usualBueng Kum, 28 January: 28.3 µg/m³, 0.7× usualBueng Kum, 29 January: 34.8 µg/m³, 0.9× usualKhan Na YaoKhan Na Yao, 20 January: 59.1 µg/m³, 1.5× usualKhan Na Yao, 21 January: 69.8 µg/m³, 1.8× usualKhan Na Yao, 22 January: 68.7 µg/m³, 1.7× usualKhan Na Yao, 23 January: 83.5 µg/m³, 2.1× usualKhan Na Yao, 24 January: 104.0 µg/m³, 2.6× usualKhan Na Yao, 25 January: 91.3 µg/m³, 2.3× usualKhan Na Yao, 26 January: 63.9 µg/m³, 1.6× usualKhan Na Yao, 27 January: 38.7 µg/m³, 1.0× usualKhan Na Yao, 28 January: 25.9 µg/m³, 0.7× usualKhan Na Yao, 29 January: 32.5 µg/m³, 0.8× usualNong ChokNong Chok, 20 January: 59.8 µg/m³, 1.7× usualNong Chok, 21 January: 60.2 µg/m³, 1.7× usualNong Chok, 22 January: 66.0 µg/m³, 1.8× usualNong Chok, 23 January: 81.8 µg/m³, 2.3× usualNong Chok, 24 January: 98.8 µg/m³, 2.7× usualNong Chok, 25 January: 93.6 µg/m³, 2.6× usualNong Chok, 26 January: 73.2 µg/m³, 2.0× usualNong Chok, 27 January: 37.4 µg/m³, 1.0× usualNong Chok, 28 January: 23.3 µg/m³, 0.6× usualNong Chok, 29 January: 30.4 µg/m³, 0.8× usualBang KapiBang Kapi, 20 January: 57.2 µg/m³, 1.6× usualBang Kapi, 21 January: 63.5 µg/m³, 1.7× usualBang Kapi, 22 January: 62.0 µg/m³, 1.7× usualBang Kapi, 23 January: 77.3 µg/m³, 2.1× usualBang Kapi, 24 January: 94.5 µg/m³, 2.6× usualBang Kapi, 25 January: 79.9 µg/m³, 2.2× usualBang Kapi, 26 January: 57.6 µg/m³, 1.6× usualBang Kapi, 27 January: 37.6 µg/m³, 1.0× usualBang Kapi, 28 January: 25.9 µg/m³, 0.7× usualBang Kapi, 29 January: 31.3 µg/m³, 0.9× usualBan Khlong PrawetBan Khlong Prawet, 20 January: 53.5 µg/m³, 1.6× usualBan Khlong Prawet, 21 January: 60.2 µg/m³, 1.8× usualBan Khlong Prawet, 22 January: 61.1 µg/m³, 1.8× usualBan Khlong Prawet, 23 January: 74.3 µg/m³, 2.2× usualBan Khlong Prawet, 24 January: 88.1 µg/m³, 2.6× usualBan Khlong Prawet, 25 January: 74.0 µg/m³, 2.2× usualBan Khlong Prawet, 26 January: 51.5 µg/m³, 1.5× usualBan Khlong Prawet, 27 January: 32.6 µg/m³, 1.0× usualBan Khlong Prawet, 28 January: 24.2 µg/m³, 0.7× usualBan Khlong Prawet, 29 January: 33.4 µg/m³, 1.0× usualBangkokBangkok, 20 January: 51.4 µg/m³, 1.5× usualBangkok, 21 January: 59.0 µg/m³, 1.7× usualBangkok, 22 January: 64.3 µg/m³, 1.9× usualBangkok, 23 January: 73.3 µg/m³, 2.1× usualBangkok, 24 January: 81.4 µg/m³, 2.3× usualBangkok, 25 January: 64.7 µg/m³, 1.9× usualBangkok, 26 January: 48.2 µg/m³, 1.4× usualBangkok, 27 January: 33.7 µg/m³, 1.0× usualBangkok, 28 January: 27.6 µg/m³, 0.8× usualBangkok, 29 January: 31.1 µg/m³, 0.9× usualKhlong 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× usualKhlong Luang, 25 January: 104.0 µg/m³, 2.4× usualKhlong Luang, 26 January: 65.1 µg/m³, 1.5× usualKhlong 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× usualNakhon Luang, 25 January: 99.9 µg/m³, 2.2× usualNakhon Luang, 26 January: 69.0 µg/m³, 1.5× usualNakhon 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× usualSamut Sakhon, 25 January: 68.4 µg/m³, 1.6× usualSamut Sakhon, 26 January: 36.5 µg/m³, 0.8× usualSamut Sakhon, 27 January: no readingSamut Sakhon, 28 January: no readingSamut Sakhon, 29 January: no readingKhlong Sam WaKhlong Sam Wa, 20 January: 66.8 µg/m³, 1.5× usualKhlong Sam Wa, 21 January: 69.3 µg/m³, 1.6× usualKhlong Sam Wa, 22 January: 65.2 µg/m³, 1.5× usualKhlong Sam Wa, 23 January: 81.1 µg/m³, 1.8× usualKhlong Sam Wa, 24 January: 101.0 µg/m³, 2.3× usualKhlong Sam Wa, 25 January: 87.7 µg/m³, 2.0× usualKhlong Sam Wa, 26 January: 64.6 µg/m³, 1.5× usualKhlong Sam Wa, 27 January: 38.8 µg/m³, 0.9× usualKhlong Sam Wa, 28 January: 32.6 µg/m³, 0.7× usualKhlong Sam Wa, 29 January: 38.7 µg/m³, 0.9× usualChai 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× usualChai Nat, 25 January: 97.4 µg/m³, 2.5× usualChai Nat, 26 January: 71.2 µg/m³, 1.8× usualChai 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× usualSing Buri, 25 January: 98.5 µg/m³, 2.2× usualSing Buri, 26 January: 79.0 µg/m³, 1.8× usualSing 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× usualPhetchaburi, 25 January: 83.4 µg/m³, 2.0× usualPhetchaburi, 26 January: 47.7 µg/m³, 1.1× usualPhetchaburi, 27 January: no readingPhetchaburi, 28 January: no readingPhetchaburi, 29 January: no readingLak SiLak Si, 20 January: 57.6 µg/m³, 1.5× usualLak Si, 21 January: 63.5 µg/m³, 1.7× usualLak Si, 22 January: 60.9 µg/m³, 1.6× usualLak Si, 23 January: 71.1 µg/m³, 1.9× usualLak Si, 24 January: 92.4 µg/m³, 2.4× usualLak Si, 25 January: 75.9 µg/m³, 2.0× usualLak Si, 26 January: 54.1 µg/m³, 1.4× usualLak Si, 27 January: 33.8 µg/m³, 0.9× usualLak Si, 28 January: 31.9 µg/m³, 0.8× usualLak Si, 29 January: 36.6 µg/m³, 1.0× usualLop 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, 2.5× usualLop Buri, 25 January: 93.8 µg/m³, 2.6× usualLop Buri, 26 January: 82.1 µg/m³, 2.3× usualLop Buri, 27 January: no readingLop Buri, 28 January: no readingLop Buri, 29 January: no readingLat KrabangLat Krabang, 20 January: 59.3 µg/m³, 1.5× usualLat Krabang, 21 January: 66.6 µg/m³, 1.6× usualLat Krabang, 22 January: 68.4 µg/m³, 1.7× usualLat Krabang, 23 January: 78.4 µg/m³, 1.9× usualLat Krabang, 24 January: 89.4 µg/m³, 2.2× usualLat Krabang, 25 January: 83.7 µg/m³, 2.1× usualLat Krabang, 26 January: 61.2 µg/m³, 1.5× usualLat Krabang, 27 January: 38.6 µg/m³, 0.9× usualLat Krabang, 28 January: 30.8 µg/m³, 0.8× usualLat Krabang, 29 January: 37.4 µg/m³, 0.9× usualSi 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× usualSi Maha Phot, 25 January: 96.5 µg/m³, 2.5× usualSi Maha Phot, 26 January: 77.3 µg/m³, 2.0× usualSi 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/m³, 1.5× usualSai Mai, 21 January: 59.0 µg/m³, 1.6× usualSai Mai, 22 January: 57.6 µg/m³, 1.6× usualSai Mai, 23 January: 69.1 µg/m³, 1.9× usualSai Mai, 24 January: 87.3 µg/m³, 2.4× usualSai Mai, 25 January: 69.8 µg/m³, 1.9× usualSai Mai, 26 January: 52.5 µg/m³, 1.5× usualSai Mai, 27 January: 32.1 µg/m³, 0.9× usualSai Mai, 28 January: 26.3 µg/m³, 0.7× usualSai Mai, 29 January: 31.1 µg/m³, 0.9× usualPhra 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× usualPhra Nakhon Si Ayutthaya, 25 January: 66.8 µg/m³, 1.9× usualPhra Nakhon Si Ayutthaya, 26 January: 52.6 µg/m³, 1.5× usualPhra 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× usualSukhothai, 25 January: 84.4 µg/m³, 2.4× usualSukhothai, 26 January: 86.5 µg/m³, 2.4× usualSukhothai, 27 January: no readingSukhothai, 28 January: no readingSukhothai, 29 January: no readingMueang NonthaburiMueang Nonthaburi, 20 January: 51.2 µg/m³, 1.3× usualMueang Nonthaburi, 21 January: 55.5 µg/m³, 1.4× usualMueang Nonthaburi, 22 January: no readingMueang Nonthaburi, 23 January: 71.0 µg/m³, 1.8× usualMueang Nonthaburi, 24 January: 83.4 µg/m³, 2.1× usualMueang Nonthaburi, 25 January: 62.4 µg/m³, 1.6× usualMueang Nonthaburi, 26 January: 45.3 µg/m³, 1.2× usualMueang Nonthaburi, 27 January: 29.2 µg/m³, 0.7× usualMueang Nonthaburi, 28 January: 26.2 µg/m³, 0.7× usualMueang Nonthaburi, 29 January: 30.1 µg/m³, 0.8× usualBan 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× usualBan Chang, 25 January: 72.5 µg/m³, 2.3× usualBan Chang, 26 January: 46.2 µg/m³, 1.5× usualBan 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× usualPhra Pradaeng, 25 January: 67.5 µg/m³, 2.0× usualPhra Pradaeng, 26 January: 47.1 µg/m³, 1.4× usualPhra 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× usualSaraburi, 25 January: 68.1 µg/m³, 2.0× usualSaraburi, 26 January: 50.5 µg/m³, 1.5× usualSaraburi, 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× usualBan Talat Bueng, 25 January: 68.4 µg/m³, 2.0× usualBan 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, 2.4× usualKalasin, 25 January: 78.9 µg/m³, 2.5× usualKalasin, 26 January: 77.0 µg/m³, 2.5× usualKalasin, 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, 2.0× usualKhon Kaen, 25 January: 69.8 µg/m³, 2.0× usualKhon Kaen, 26 January: 79.7 µg/m³, 2.2× usualKhon 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× usualLaem Chabang, 25 January: 63.9 µg/m³, 2.0× usualLaem Chabang, 26 January: 40.2 µg/m³, 1.3× usualLaem 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× usualYasothon, 25 January: 82.9 µg/m³, 3.0× usualYasothon, 26 January: 68.0 µg/m³, 2.5× usualYasothon, 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× usualUbon Ratchathani, 25 January: 77.3 µg/m³, 2.8× usualUbon Ratchathani, 26 January: 64.5 µg/m³, 2.4× usualUbon 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, 2.3× usualChaiyaphum, 25 January: 78.0 µg/m³, 2.9× usualChaiyaphum, 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× usualRayong, 25 January: 62.8 µg/m³, 2.2× usualRayong, 26 January: 43.1 µg/m³, 1.5× usualRayong, 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, 2.5× usualUdon Thani, 25 January: 68.4 µg/m³, 2.8× usualUdon Thani, 26 January: 57.1 µg/m³, 2.4× usualUdon 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× usualSamut Prakan, 25 January: 50.4 µg/m³, 1.7× usualSamut Prakan, 26 January: 34.4 µg/m³, 1.2× usualSamut 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, 2.3× usualNong Bua Lamphu, 25 January: 59.6 µg/m³, 2.3× usualNong Bua Lamphu, 26 January: 63.2 µg/m³, 2.5× usualNong 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, 2.7× usualSi Sa Ket, 25 January: no readingSi Sa Ket, 26 January: 75.6 µg/m³, 3.4× usualSi 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× usualNakhon Nayok, 25 January: 44.8 µg/m³, 1.8× usualNakhon Nayok, 26 January: 41.5 µg/m³, 1.6× usualNakhon 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× usualRoi Et, 25 January: 67.5 µg/m³, 3.0× usualRoi Et, 26 January: 64.0 µg/m³, 2.8× usualRoi 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× usualChanthaburi, 25 January: 56.0 µg/m³, 2.1× usualChanthaburi, 26 January: 48.6 µg/m³, 1.9× usualChanthaburi, 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× usualBuri Ram, 25 January: 67.7 µg/m³, 2.7× usualBuri Ram, 26 January: 71.8 µg/m³, 2.8× usualBuri 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× usualMukdahan, 25 January: 62.3 µg/m³, 2.5× usualMukdahan, 26 January: 44.8 µg/m³, 1.8× usualMukdahan, 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, 2.0× usualSakon Nakhon, 25 January: 47.7 µg/m³, 2.6× usualSakon Nakhon, 26 January: 42.5 µg/m³, 2.3× usualSakon 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× usualBang Bo District, 26 January: 40.3 µg/m³, 1.2× usualBang 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/m³, 1.8× usualSurin, 25 January: 67.1 µg/m³, 2.2× usualSurin, 26 January: 66.4 µg/m³, 2.1× usualSurin, 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/m³, 1.8× usualMaha Sarakham, 25 January: 61.7 µg/m³, 2.0× usualMaha Sarakham, 26 January: 64.5 µg/m³, 2.1× usualMaha 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/m³, 1.9× usualAmnat Charoen, 25 January: 58.4 µg/m³, 2.5× usualAmnat Charoen, 26 January: 43.8 µg/m³, 1.9× usualAmnat 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/m³, 1.8× usualPhetchabun, 25 January: 58.9 µg/m³, 1.8× usualPhetchabun, 26 January: 64.3 µg/m³, 2.0× usualPhetchabun, 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×
Udon ThaniUdon Thani, Thailand3 68.425 January24.12.8×
Buri RamBuriram, Thailand3 71.826 January25.42.8×
Nong ChokBangkok, Thailand4 98.824 January36.02.7×
Khlong LuangPathum Thani, Thailand2 117.024 January42.82.7×
Bueng KumBangkok, Thailand3 107.024 January39.72.7×
Ban ChangRayong, Thailand2 82.824 January31.32.6×
Khan Na YaoBangkok, Thailand3 104.024 January39.52.6×
Sakon NakhonSakon Nakhon, Thailand3 47.725 January18.22.6×
Ban Khlong PrawetBangkok, Thailand3 88.124 January33.82.6×
Lop BuriLopburi, Thailand3 93.825 January36.32.6×
Bang KapiBangkok, Thailand3 94.524 January36.72.6×
Chai NatChai Nat, Thailand2 99.824 January39.12.6×
KalasinKalasin, Thailand3 78.925 January31.02.5×
Nakhon LuangPhra Nakhon Si Ayutthaya, Thailand2 115.024 January45.22.5×
Bang NaBangkok, Thailand3 101.024 January40.02.5×
Amnat CharoenAmnat Charoen, Thailand1 58.425 January23.22.5×
Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand1 86.424 January34.52.5×
Si Maha PhotPrachin Buri, Thailand2 96.525 January38.72.5×
MukdahanMukdahan, Thailand2 62.325 January25.12.5×
Nong KhaemBangkok, Thailand2 103.824 January42.12.5×
Nong Bua LamphuNong Bua Lamphu, Thailand3 63.226 January25.72.5×
Lak SiBangkok, Thailand2 92.424 January37.82.4×
SukhothaiSukhothai, Thailand3 86.526 January35.62.4×
Phra PradaengSamut Prakan, Thailand2 81.624 January33.72.4×
Sai MaiBangkok, Thailand1 87.324 January36.12.4×
BangkokBangkok, Thailand2 81.424 January34.72.3×
SaraburiSaraburi, Thailand1 80.524 January34.42.3×
Samut SakhonSamut Sakhon, Thailand1 102.024 January44.02.3×
Khlong Sam WaBangkok, Thailand2 101.024 January44.42.3×
Ban Talat BuengChon Buri, Thailand2 76.224 January33.72.3×
Nakhon NayokNakhon Nayok, Thailand1 56.824 January25.22.3×
PhetchaburiPhetchaburi, Thailand1 95.624 January42.62.2×
Khon KaenKhon Kaen, Thailand2 79.726 January35.72.2×
RayongRayong, Thailand2 62.825 January28.32.2×
Sing BuriSing Buri, Thailand2 98.525 January44.72.2×
Lat KrabangBangkok, Thailand2 89.424 January40.72.2×
SurinSurin, Thailand2 67.125 January31.22.2×
ChanthaburiChanthaburi, Thailand2 56.025 January26.12.1×
Mueang NonthaburiNonthaburi, Thailand1 83.424 January39.02.1×
Laem ChabangChon Buri, Thailand2 68.124 January31.92.1×
Ban Samae DamBangkok, Thailand2 79.923 January37.62.1×
Samut PrakanSamut Prakan, Thailand1 60.224 January28.92.1×
Bang Bo DistrictSamut Prakan, Thailand1 70.125 January33.82.1×
Maha SarakhamMaha Sarakham, Thailand2 64.526 January31.32.1×
PhetchabunPhetchabun, Thailand1 64.326 January31.92.0×

Daily means in µg/m³. Usual: the city's median for this time of year (its days within 21 days of the date, every year, leaving out the week around it). Above usual: its highest day against that.

Against other episodes in Thailand

Number 2 of 7 episodes in Thailand since our records began, by cities reached.

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

Use this page

SmogRank, Central Thailand, January 2025: 50 cities with PM2.5 at twice their usual or more, 23 to 26 January 2025, smogrank.com/episodes/2025-01-central-thailand (accessed 2 October 2026).

Download top 10 (PNG)

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.