SmogRank / Episodes / Thailand
Thailand, April 2023
For 8 days, from 14 to 21 April 2023, 35 cities in Thailand had PM2.5 at least twice their usual for the time of year. The worst reading was Chai Nat, Chai Nat, Thailand: 90.9 µg/m³ on 17 April, about 2.3× its usual 40.3.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 35 in 1 country
Days 8 14 to 21 April 2023
Worst day 16 April 33 cities counted
Furthest above usual 3.3× Samut Prakan
Day by day
Play 16 April 33 cities at twice their usual or more
Si Maha Phot Bang Khun Thian Saraburi Nakhon Ratchasima Kanchanaburi Nakhon Sawan Chaiyaphum Buri Ram Roi Et Si Sa Ket Ubon Ratchathani Khlong Luang Trat Lop Buri Aranyaprathet Khlong Sam Wa Phra Nakhon Si Ayutthaya Sing Buri Bang Bo District Khan Na Yao Suphan Buri Chai Nat Nong Chok Lat Krabang Sai Mai Bang Kapi Saphan Sung Bang Na Ratchaburi Ban Talat Bueng Mueang Nonthaburi Phra Pradaeng Lak Si Ban Chang Bangkok Nong Khaem Ban Khlong Prawet Samut Sakhon Bueng Kum Ban Samae Dam Rayong Nakhon Pathom Chanthaburi Laem Chabang Hua Hin Samut Prakan 11 Apr 12 13 14 15 16 17 18 19 20 21 22 23 24 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
Nakhon Pathom Nakhon Pathom, 11 April: 25.9 µg/m³ Nakhon Pathom, 12 April: 34.6 µg/m³ Nakhon Pathom, 13 April: 42.5 µg/m³ Nakhon Pathom, 14 April: 46.4 µg/m³, 2.0× its usual 22.7 Nakhon Pathom, 15 April: 61.9 µg/m³, 2.7× its usual 22.7 Nakhon Pathom, 16 April: 63.1 µg/m³, 2.9× its usual 22.0 Nakhon Pathom, 17 April: 52.5 µg/m³, 2.4× its usual 21.8 Nakhon Pathom, 18 April: 48.0 µg/m³, 2.2× its usual 21.7 Nakhon Pathom, 19 April: 46.1 µg/m³, 2.1× its usual 21.6 Nakhon Pathom, 20 April: 49.0 µg/m³, 2.3× its usual 21.3 Nakhon Pathom, 21 April: 50.8 µg/m³, 2.4× its usual 21.2 Nakhon Pathom, 22 April: no reading Nakhon Pathom, 23 April: no reading Nakhon Pathom, 24 April: 31.1 µg/m³ Bangkok Bangkok, 11 April: 25.7 µg/m³ Bangkok, 12 April: 35.4 µg/m³ Bangkok, 13 April: 41.8 µg/m³ Bangkok, 14 April: 46.0 µg/m³, 2.0× its usual 22.8 Bangkok, 15 April: 55.1 µg/m³, 2.4× its usual 22.8 Bangkok, 16 April: 59.4 µg/m³, 2.6× its usual 22.7 Bangkok, 17 April: 50.1 µg/m³, 2.2× its usual 22.4 Bangkok, 18 April: 48.3 µg/m³, 2.2× its usual 22.2 Bangkok, 19 April: 46.1 µg/m³, 2.1× its usual 22.2 Bangkok, 20 April: 47.9 µg/m³, 2.2× its usual 22.1 Bangkok, 21 April: 51.6 µg/m³, 2.3× its usual 22.1 Bangkok, 22 April: no reading Bangkok, 23 April: no reading Bangkok, 24 April: 29.0 µg/m³ Samut Prakan Samut Prakan, 11 April: 19.4 µg/m³ Samut Prakan, 12 April: 29.8 µg/m³ Samut Prakan, 13 April: 40.1 µg/m³ Samut Prakan, 14 April: 44.1 µg/m³, 2.3× its usual 18.8 Samut Prakan, 15 April: 56.2 µg/m³, 3.0× its usual 18.9 Samut Prakan, 16 April: 63.3 µg/m³, 3.3× its usual 18.9 Samut Prakan, 17 April: 54.3 µg/m³, 2.9× its usual 18.8 Samut Prakan, 18 April: 45.2 µg/m³, 2.4× its usual 18.7 Samut Prakan, 19 April: 43.6 µg/m³, 2.3× its usual 18.7 Samut Prakan, 20 April: 49.5 µg/m³, 2.7× its usual 18.2 Samut Prakan, 21 April: 53.4 µg/m³, 2.9× its usual 18.2 Samut Prakan, 22 April: no reading Samut Prakan, 23 April: no reading Samut Prakan, 24 April: 27.5 µg/m³ Samut Sakhon Samut Sakhon, 11 April: 22.6 µg/m³ Samut Sakhon, 12 April: 28.4 µg/m³ Samut Sakhon, 13 April: 35.6 µg/m³ Samut Sakhon, 14 April: 40.8 µg/m³, 2.0× its usual 20.4 Samut Sakhon, 15 April: 49.9 µg/m³, 2.4× its usual 20.6 Samut Sakhon, 16 April: 56.5 µg/m³, 2.7× its usual 20.7 Samut Sakhon, 17 April: 48.4 µg/m³, 2.3× its usual 20.6 Samut Sakhon, 18 April: 43.3 µg/m³, 2.1× its usual 20.7 Samut Sakhon, 19 April: 44.3 µg/m³, 2.1× its usual 20.7 Samut Sakhon, 20 April: 43.9 µg/m³, 2.1× its usual 20.7 Samut Sakhon, 21 April: 47.2 µg/m³, 2.3× its usual 20.9 Samut Sakhon, 22 April: no reading Samut Sakhon, 23 April: no reading Samut Sakhon, 24 April: 21.4 µg/m³ Nong Khaem Nong Khaem, 11 April: 27.6 µg/m³ Nong Khaem, 12 April: 36.8 µg/m³ Nong Khaem, 13 April: 41.7 µg/m³ Nong Khaem, 14 April: 45.2 µg/m³ Nong Khaem, 15 April: 53.5 µg/m³, 2.2× its usual 24.2 Nong Khaem, 16 April: 64.1 µg/m³, 2.6× its usual 24.2 Nong Khaem, 17 April: 54.9 µg/m³, 2.3× its usual 24.0 Nong Khaem, 18 April: 50.5 µg/m³, 2.1× its usual 24.1 Nong Khaem, 19 April: 47.4 µg/m³ Nong Khaem, 20 April: 52.6 µg/m³, 2.2× its usual 24.0 Nong Khaem, 21 April: 56.7 µg/m³, 2.4× its usual 24.0 Nong Khaem, 22 April: no reading Nong Khaem, 23 April: no reading Nong Khaem, 24 April: 30.8 µg/m³ Mueang Nonthaburi Mueang Nonthaburi, 11 April: 23.3 µg/m³ Mueang Nonthaburi, 12 April: 34.5 µg/m³ Mueang Nonthaburi, 13 April: 38.5 µg/m³ Mueang Nonthaburi, 14 April: 41.4 µg/m³ Mueang Nonthaburi, 15 April: 49.5 µg/m³, 2.3× its usual 22.0 Mueang Nonthaburi, 16 April: 54.0 µg/m³, 2.5× its usual 22.0 Mueang Nonthaburi, 17 April: 45.4 µg/m³, 2.1× its usual 21.6 Mueang Nonthaburi, 18 April: 41.0 µg/m³ Mueang Nonthaburi, 19 April: 41.9 µg/m³ Mueang Nonthaburi, 20 April: 44.8 µg/m³, 2.1× its usual 21.3 Mueang Nonthaburi, 21 April: 47.8 µg/m³, 2.3× its usual 20.6 Mueang Nonthaburi, 22 April: no reading Mueang Nonthaburi, 23 April: no reading Mueang Nonthaburi, 24 April: 25.5 µg/m³ Phra Pradaeng Phra Pradaeng, 11 April: 19.3 µg/m³ Phra Pradaeng, 12 April: 28.0 µg/m³ Phra Pradaeng, 13 April: 35.1 µg/m³ Phra Pradaeng, 14 April: 42.1 µg/m³ Phra Pradaeng, 15 April: 48.0 µg/m³, 2.2× its usual 21.9 Phra Pradaeng, 16 April: 55.2 µg/m³, 2.5× its usual 21.9 Phra Pradaeng, 17 April: 45.7 µg/m³, 2.1× its usual 21.7 Phra Pradaeng, 18 April: 41.8 µg/m³ Phra Pradaeng, 19 April: 42.7 µg/m³ Phra Pradaeng, 20 April: 45.5 µg/m³, 2.1× its usual 21.4 Phra Pradaeng, 21 April: 48.1 µg/m³, 2.2× its usual 21.4 Phra Pradaeng, 22 April: no reading Phra Pradaeng, 23 April: no reading Phra Pradaeng, 24 April: 25.0 µg/m³ Bang Kapi Bang Kapi, 11 April: 26.5 µg/m³ Bang Kapi, 12 April: 34.5 µg/m³ Bang Kapi, 13 April: 36.1 µg/m³ Bang Kapi, 14 April: 40.8 µg/m³ Bang Kapi, 15 April: 46.6 µg/m³, 2.1× its usual 22.7 Bang Kapi, 16 April: 55.5 µg/m³, 2.4× its usual 22.7 Bang Kapi, 17 April: 45.6 µg/m³, 2.0× its usual 22.5 Bang Kapi, 18 April: 40.8 µg/m³ Bang Kapi, 19 April: 38.0 µg/m³ Bang Kapi, 20 April: 46.5 µg/m³, 2.1× its usual 22.0 Bang Kapi, 21 April: 48.1 µg/m³, 2.2× its usual 22.1 Bang Kapi, 22 April: no reading Bang Kapi, 23 April: no reading Bang Kapi, 24 April: 29.5 µg/m³ Bang Bo District Bang Bo District, 11 April: 21.3 µg/m³ Bang Bo District, 12 April: 28.3 µg/m³ Bang Bo District, 13 April: 36.3 µg/m³ Bang Bo District, 14 April: no reading Bang Bo District, 15 April: 43.3 µg/m³, 2.0× its usual 21.4 Bang Bo District, 16 April: 49.2 µg/m³, 2.3× its usual 21.4 Bang Bo District, 17 April: 42.7 µg/m³, 2.0× its usual 21.3 Bang Bo District, 18 April: 37.8 µg/m³ Bang Bo District, 19 April: 35.5 µg/m³ Bang Bo District, 20 April: no reading Bang Bo District, 21 April: no reading Bang Bo District, 22 April: no reading Bang Bo District, 23 April: no reading Bang Bo District, 24 April: 30.2 µg/m³ Sing Buri Sing Buri, 11 April: 47.0 µg/m³ Sing Buri, 12 April: 62.1 µg/m³ Sing Buri, 13 April: no reading Sing Buri, 14 April: no reading Sing Buri, 15 April: no reading Sing Buri, 16 April: 84.3 µg/m³, 2.2× its usual 38.0 Sing Buri, 17 April: 83.0 µg/m³, 2.2× its usual 37.3 Sing Buri, 18 April: no reading Sing Buri, 19 April: no reading Sing Buri, 20 April: 61.6 µg/m³ Sing Buri, 21 April: 69.6 µg/m³ Sing Buri, 22 April: no reading Sing Buri, 23 April: no reading Sing Buri, 24 April: 58.7 µg/m³ Chai Nat Chai Nat, 11 April: 43.7 µg/m³ Chai Nat, 12 April: 65.3 µg/m³ Chai Nat, 13 April: no reading Chai Nat, 14 April: no reading Chai Nat, 15 April: no reading Chai Nat, 16 April: 83.4 µg/m³, 2.0× its usual 41.1 Chai Nat, 17 April: 90.9 µg/m³, 2.3× its usual 40.3 Chai Nat, 18 April: no reading Chai Nat, 19 April: no reading Chai Nat, 20 April: 63.5 µg/m³ Chai Nat, 21 April: 66.0 µg/m³ Chai Nat, 22 April: no reading Chai Nat, 23 April: no reading Chai Nat, 24 April: 55.8 µg/m³ Suphan Buri Suphan Buri, 11 April: 35.9 µg/m³ Suphan Buri, 12 April: 50.2 µg/m³ Suphan Buri, 13 April: no reading Suphan Buri, 14 April: no reading Suphan Buri, 15 April: no reading Suphan Buri, 16 April: 77.8 µg/m³, 2.3× its usual 33.8 Suphan Buri, 17 April: 78.0 µg/m³, 2.3× its usual 33.7 Suphan Buri, 18 April: no reading Suphan Buri, 19 April: no reading Suphan Buri, 20 April: 57.4 µg/m³ Suphan Buri, 21 April: 68.9 µg/m³, 2.1× its usual 33.4 Suphan Buri, 22 April: no reading Suphan Buri, 23 April: no reading Suphan Buri, 24 April: 52.5 µg/m³ Lop Buri Lop Buri, 11 April: 42.5 µg/m³ Lop Buri, 12 April: 53.8 µg/m³ Lop Buri, 13 April: no reading Lop Buri, 14 April: no reading Lop Buri, 15 April: no reading Lop Buri, 16 April: 72.1 µg/m³, 2.1× its usual 35.0 Lop Buri, 17 April: 59.4 µg/m³ Lop Buri, 18 April: no reading Lop Buri, 19 April: no reading Lop Buri, 20 April: 62.0 µg/m³ Lop Buri, 21 April: 68.7 µg/m³, 2.1× its usual 33.2 Lop Buri, 22 April: no reading Lop Buri, 23 April: no reading Lop Buri, 24 April: 45.4 µg/m³ Ratchaburi Ratchaburi, 11 April: 34.8 µg/m³ Ratchaburi, 12 April: 42.7 µg/m³ Ratchaburi, 13 April: no reading Ratchaburi, 14 April: no reading Ratchaburi, 15 April: no reading Ratchaburi, 16 April: 70.8 µg/m³, 2.4× its usual 29.6 Ratchaburi, 17 April: 62.0 µg/m³, 2.1× its usual 29.5 Ratchaburi, 18 April: no reading Ratchaburi, 19 April: no reading Ratchaburi, 20 April: 53.7 µg/m³ Ratchaburi, 21 April: 52.6 µg/m³ Ratchaburi, 22 April: no reading Ratchaburi, 23 April: no reading Ratchaburi, 24 April: 39.1 µg/m³ Bang Na Bang Na, 11 April: 33.9 µg/m³ Bang Na, 12 April: 43.4 µg/m³ Bang Na, 13 April: no reading Bang Na, 14 April: no reading Bang Na, 15 April: no reading Bang Na, 16 April: 65.5 µg/m³, 2.4× its usual 27.5 Bang Na, 17 April: 56.6 µg/m³, 2.1× its usual 27.5 Bang Na, 18 April: no reading Bang Na, 19 April: no reading Bang Na, 20 April: 56.8 µg/m³, 2.1× its usual 27.4 Bang Na, 21 April: 60.6 µg/m³, 2.2× its usual 27.5 Bang Na, 22 April: no reading Bang Na, 23 April: no reading Bang Na, 24 April: 36.9 µg/m³ Hua Hin Hua Hin, 11 April: 27.9 µg/m³ Hua Hin, 12 April: 39.1 µg/m³ Hua Hin, 13 April: no reading Hua Hin, 14 April: no reading Hua Hin, 15 April: no reading Hua Hin, 16 April: 64.3 µg/m³, 3.0× its usual 21.2 Hua Hin, 17 April: 49.9 µg/m³, 2.4× its usual 21.0 Hua Hin, 18 April: no reading Hua Hin, 19 April: no reading Hua Hin, 20 April: 50.2 µg/m³, 2.4× its usual 20.5 Hua Hin, 21 April: 44.4 µg/m³, 2.2× its usual 20.3 Hua Hin, 22 April: no reading Hua Hin, 23 April: no reading Hua Hin, 24 April: 31.8 µg/m³ Ban Samae Dam Ban Samae Dam, 11 April: 27.1 µg/m³ Ban Samae Dam, 12 April: 37.0 µg/m³ Ban Samae Dam, 13 April: no reading Ban Samae Dam, 14 April: no reading Ban Samae Dam, 15 April: no reading Ban Samae Dam, 16 April: 62.3 µg/m³, 2.7× its usual 23.2 Ban Samae Dam, 17 April: 51.5 µg/m³, 2.2× its usual 22.9 Ban Samae Dam, 18 April: no reading Ban Samae Dam, 19 April: no reading Ban Samae Dam, 20 April: 50.1 µg/m³, 2.2× its usual 22.7 Ban Samae Dam, 21 April: 54.0 µg/m³, 2.4× its usual 22.7 Ban Samae Dam, 22 April: no reading Ban Samae Dam, 23 April: no reading Ban Samae Dam, 24 April: 30.0 µg/m³ Phra Nakhon Si Ayut… Phra Nakhon Si Ayutthaya, 11 April: 26.7 µg/m³ Phra Nakhon Si Ayutthaya, 12 April: 40.8 µg/m³ Phra Nakhon Si Ayutthaya, 13 April: no reading Phra Nakhon Si Ayutthaya, 14 April: no reading Phra Nakhon Si Ayutthaya, 15 April: no reading Phra Nakhon Si Ayutthaya, 16 April: 60.1 µg/m³, 2.2× its usual 27.7 Phra Nakhon Si Ayutthaya, 17 April: 56.7 µg/m³, 2.1× its usual 27.6 Phra Nakhon Si Ayutthaya, 18 April: no reading Phra Nakhon Si Ayutthaya, 19 April: no reading Phra Nakhon Si Ayutthaya, 20 April: 49.3 µg/m³ Phra Nakhon Si Ayutthaya, 21 April: 57.3 µg/m³, 2.2× its usual 26.2 Phra Nakhon Si Ayutthaya, 22 April: no reading Phra Nakhon Si Ayutthaya, 23 April: no reading Phra Nakhon Si Ayutthaya, 24 April: 41.0 µg/m³ Khlong Sam Wa Khlong Sam Wa, 11 April: 29.5 µg/m³ Khlong Sam Wa, 12 April: 40.2 µg/m³ Khlong Sam Wa, 13 April: no reading Khlong Sam Wa, 14 April: no reading Khlong Sam Wa, 15 April: no reading Khlong Sam Wa, 16 April: 60.0 µg/m³, 2.2× its usual 26.8 Khlong Sam Wa, 17 April: 54.6 µg/m³, 2.0× its usual 26.9 Khlong Sam Wa, 18 April: no reading Khlong Sam Wa, 19 April: no reading Khlong Sam Wa, 20 April: 52.3 µg/m³ Khlong Sam Wa, 21 April: 54.7 µg/m³, 2.0× its usual 26.9 Khlong Sam Wa, 22 April: no reading Khlong Sam Wa, 23 April: no reading Khlong Sam Wa, 24 April: 35.5 µg/m³ Bueng Kum Bueng Kum, 11 April: 24.3 µg/m³ Bueng Kum, 12 April: 35.3 µg/m³ Bueng Kum, 13 April: no reading Bueng Kum, 14 April: no reading Bueng Kum, 15 April: no reading Bueng Kum, 16 April: 57.7 µg/m³, 2.7× its usual 21.2 Bueng Kum, 17 April: 52.0 µg/m³, 2.5× its usual 21.2 Bueng Kum, 18 April: no reading Bueng Kum, 19 April: no reading Bueng Kum, 20 April: 49.3 µg/m³, 2.3× its usual 21.2 Bueng Kum, 21 April: 51.3 µg/m³, 2.4× its usual 21.2 Bueng Kum, 22 April: no reading Bueng Kum, 23 April: no reading Bueng Kum, 24 April: 30.5 µg/m³ Lak Si Lak Si, 11 April: 25.6 µg/m³ Lak Si, 12 April: 35.8 µg/m³ Lak Si, 13 April: no reading Lak Si, 14 April: no reading Lak Si, 15 April: no reading Lak Si, 16 April: 57.7 µg/m³, 2.5× its usual 23.5 Lak Si, 17 April: 49.9 µg/m³, 2.1× its usual 23.7 Lak Si, 18 April: no reading Lak Si, 19 April: no reading Lak Si, 20 April: 48.0 µg/m³, 2.0× its usual 23.5 Lak Si, 21 April: 50.3 µg/m³, 2.1× its usual 23.5 Lak Si, 22 April: no reading Lak Si, 23 April: no reading Lak Si, 24 April: 28.3 µg/m³ Saphan Sung Saphan Sung, 11 April: 25.7 µg/m³ Saphan Sung, 12 April: 35.5 µg/m³ Saphan Sung, 13 April: no reading Saphan Sung, 14 April: no reading Saphan Sung, 15 April: no reading Saphan Sung, 16 April: 57.2 µg/m³, 2.4× its usual 24.0 Saphan Sung, 17 April: 49.8 µg/m³, 2.1× its usual 24.1 Saphan Sung, 18 April: no reading Saphan Sung, 19 April: no reading Saphan Sung, 20 April: 47.0 µg/m³ Saphan Sung, 21 April: 48.8 µg/m³, 2.0× its usual 24.0 Saphan Sung, 22 April: no reading Saphan Sung, 23 April: no reading Saphan Sung, 24 April: no reading Khan Na Yao Khan Na Yao, 11 April: 24.9 µg/m³ Khan Na Yao, 12 April: 38.4 µg/m³ Khan Na Yao, 13 April: no reading Khan Na Yao, 14 April: no reading Khan Na Yao, 15 April: no reading Khan Na Yao, 16 April: 57.0 µg/m³, 2.3× its usual 24.8 Khan Na Yao, 17 April: 53.5 µg/m³, 2.1× its usual 25.0 Khan Na Yao, 18 April: no reading Khan Na Yao, 19 April: no reading Khan Na Yao, 20 April: 50.0 µg/m³, 2.0× its usual 24.9 Khan Na Yao, 21 April: 52.7 µg/m³, 2.1× its usual 24.9 Khan Na Yao, 22 April: no reading Khan Na Yao, 23 April: no reading Khan Na Yao, 24 April: 33.2 µg/m³ Sai Mai Sai Mai, 11 April: 26.0 µg/m³ Sai Mai, 12 April: 35.9 µg/m³ Sai Mai, 13 April: no reading Sai Mai, 14 April: no reading Sai Mai, 15 April: no reading Sai Mai, 16 April: 55.3 µg/m³, 2.4× its usual 23.2 Sai Mai, 17 April: 47.4 µg/m³, 2.1× its usual 23.1 Sai Mai, 18 April: no reading Sai Mai, 19 April: no reading Sai Mai, 20 April: 45.0 µg/m³ Sai Mai, 21 April: 47.6 µg/m³, 2.1× its usual 22.5 Sai Mai, 22 April: no reading Sai Mai, 23 April: no reading Sai Mai, 24 April: 28.0 µg/m³ Lat Krabang Lat Krabang, 11 April: 21.6 µg/m³ Lat Krabang, 12 April: 32.3 µg/m³ Lat Krabang, 13 April: no reading Lat Krabang, 14 April: no reading Lat Krabang, 15 April: no reading Lat Krabang, 16 April: 55.2 µg/m³, 2.4× its usual 23.0 Lat Krabang, 17 April: 50.4 µg/m³, 2.2× its usual 22.9 Lat Krabang, 18 April: no reading Lat Krabang, 19 April: no reading Lat Krabang, 20 April: 46.5 µg/m³, 2.1× its usual 22.6 Lat Krabang, 21 April: 48.3 µg/m³, 2.1× its usual 22.6 Lat Krabang, 22 April: no reading Lat Krabang, 23 April: no reading Lat Krabang, 24 April: 30.1 µg/m³ Ban Chang Ban Chang, 11 April: 23.1 µg/m³ Ban Chang, 12 April: 33.1 µg/m³ Ban Chang, 13 April: no reading Ban Chang, 14 April: no reading Ban Chang, 15 April: no reading Ban Chang, 16 April: 54.7 µg/m³, 2.6× its usual 21.3 Ban Chang, 17 April: 51.8 µg/m³, 2.4× its usual 21.2 Ban Chang, 18 April: no reading Ban Chang, 19 April: no reading Ban Chang, 20 April: 52.6 µg/m³, 2.5× its usual 21.0 Ban Chang, 21 April: 49.2 µg/m³, 2.3× its usual 21.0 Ban Chang, 22 April: no reading Ban Chang, 23 April: no reading Ban Chang, 24 April: 29.2 µg/m³ Nong Chok Nong Chok, 11 April: 22.7 µg/m³ Nong Chok, 12 April: 36.3 µg/m³ Nong Chok, 13 April: no reading Nong Chok, 14 April: no reading Nong Chok, 15 April: no reading Nong Chok, 16 April: 54.4 µg/m³, 2.4× its usual 23.0 Nong Chok, 17 April: 48.7 µg/m³, 2.1× its usual 22.8 Nong Chok, 18 April: no reading Nong Chok, 19 April: no reading Nong Chok, 20 April: 46.2 µg/m³, 2.1× its usual 21.9 Nong Chok, 21 April: 48.4 µg/m³, 2.2× its usual 21.9 Nong Chok, 22 April: no reading Nong Chok, 23 April: no reading Nong Chok, 24 April: no reading Ban Khlong Prawet Ban Khlong Prawet, 11 April: 22.0 µg/m³ Ban Khlong Prawet, 12 April: 31.2 µg/m³ Ban Khlong Prawet, 13 April: no reading Ban Khlong Prawet, 14 April: no reading Ban Khlong Prawet, 15 April: no reading Ban Khlong Prawet, 16 April: 53.9 µg/m³, 2.7× its usual 20.0 Ban Khlong Prawet, 17 April: 45.5 µg/m³, 2.3× its usual 20.0 Ban Khlong Prawet, 18 April: no reading Ban Khlong Prawet, 19 April: no reading Ban Khlong Prawet, 20 April: 44.3 µg/m³, 2.2× its usual 19.9 Ban Khlong Prawet, 21 April: 45.7 µg/m³, 2.3× its usual 19.8 Ban Khlong Prawet, 22 April: no reading Ban Khlong Prawet, 23 April: no reading Ban Khlong Prawet, 24 April: 27.5 µg/m³ Laem Chabang Laem Chabang, 11 April: 26.2 µg/m³ Laem Chabang, 12 April: 31.1 µg/m³ Laem Chabang, 13 April: no reading Laem Chabang, 14 April: no reading Laem Chabang, 15 April: no reading Laem Chabang, 16 April: 53.4 µg/m³, 3.0× its usual 17.8 Laem Chabang, 17 April: 48.2 µg/m³, 2.7× its usual 17.8 Laem Chabang, 18 April: no reading Laem Chabang, 19 April: no reading Laem Chabang, 20 April: 44.4 µg/m³, 2.5× its usual 17.7 Laem Chabang, 21 April: 46.2 µg/m³, 2.6× its usual 17.7 Laem Chabang, 22 April: no reading Laem Chabang, 23 April: no reading Laem Chabang, 24 April: 28.6 µg/m³ Khlong Luang Khlong Luang, 11 April: 22.1 µg/m³ Khlong Luang, 12 April: 33.8 µg/m³ Khlong Luang, 13 April: 38.3 µg/m³ Khlong Luang, 14 April: 38.6 µg/m³ Khlong Luang, 15 April: 48.0 µg/m³ Khlong Luang, 16 April: 52.4 µg/m³, 2.0× its usual 26.2 Khlong Luang, 17 April: 47.5 µg/m³ Khlong Luang, 18 April: 44.9 µg/m³ Khlong Luang, 19 April: 38.5 µg/m³ Khlong Luang, 20 April: 44.7 µg/m³ Khlong Luang, 21 April: 46.8 µg/m³ Khlong Luang, 22 April: no reading Khlong Luang, 23 April: no reading Khlong Luang, 24 April: 30.8 µg/m³ Ban Talat Bueng Ban Talat Bueng, 11 April: 20.6 µg/m³ Ban Talat Bueng, 12 April: 33.9 µg/m³ Ban Talat Bueng, 13 April: no reading Ban Talat Bueng, 14 April: no reading Ban Talat Bueng, 15 April: no reading Ban Talat Bueng, 16 April: 52.1 µg/m³, 2.5× its usual 20.6 Ban Talat Bueng, 17 April: 44.4 µg/m³, 2.2× its usual 20.3 Ban Talat Bueng, 18 April: no reading Ban Talat Bueng, 19 April: no reading Ban Talat Bueng, 20 April: 42.6 µg/m³, 2.1× its usual 20.0 Ban Talat Bueng, 21 April: 42.8 µg/m³, 2.1× its usual 20.0 Ban Talat Bueng, 22 April: no reading Ban Talat Bueng, 23 April: no reading Ban Talat Bueng, 24 April: 29.7 µg/m³ Rayong Rayong, 11 April: 20.5 µg/m³ Rayong, 12 April: 25.8 µg/m³ Rayong, 13 April: no reading Rayong, 14 April: no reading Rayong, 15 April: no reading Rayong, 16 April: 49.5 µg/m³, 2.9× its usual 17.3 Rayong, 17 April: 46.1 µg/m³, 2.7× its usual 17.3 Rayong, 18 April: no reading Rayong, 19 April: no reading Rayong, 20 April: 39.1 µg/m³, 2.3× its usual 17.2 Rayong, 21 April: 43.8 µg/m³, 2.5× its usual 17.2 Rayong, 22 April: no reading Rayong, 23 April: no reading Rayong, 24 April: 28.7 µg/m³ Chanthaburi Chanthaburi, 11 April: 17.8 µg/m³ Chanthaburi, 12 April: 26.7 µg/m³ Chanthaburi, 13 April: no reading Chanthaburi, 14 April: no reading Chanthaburi, 15 April: no reading Chanthaburi, 16 April: 45.5 µg/m³, 2.7× its usual 16.8 Chanthaburi, 17 April: 36.6 µg/m³, 2.2× its usual 16.7 Chanthaburi, 18 April: no reading Chanthaburi, 19 April: no reading Chanthaburi, 20 April: 33.0 µg/m³, 2.1× its usual 15.9 Chanthaburi, 21 April: 47.3 µg/m³, 3.0× its usual 15.7 Chanthaburi, 22 April: no reading Chanthaburi, 23 April: no reading Chanthaburi, 24 April: 23.6 µg/m³ Aranyaprathet Aranyaprathet, 11 April: 20.3 µg/m³ Aranyaprathet, 12 April: 26.1 µg/m³ Aranyaprathet, 13 April: no reading Aranyaprathet, 14 April: no reading Aranyaprathet, 15 April: no reading Aranyaprathet, 16 April: 33.9 µg/m³ Aranyaprathet, 17 April: 35.3 µg/m³ Aranyaprathet, 18 April: no reading Aranyaprathet, 19 April: no reading Aranyaprathet, 20 April: 28.2 µg/m³ Aranyaprathet, 21 April: 39.6 µg/m³, 2.2× its usual 17.9 Aranyaprathet, 22 April: no reading Aranyaprathet, 23 April: no reading Aranyaprathet, 24 April: 23.1 µg/m³ Trat Trat, 11 April: 21.0 µg/m³ Trat, 12 April: 26.2 µg/m³ Trat, 13 April: no reading Trat, 14 April: no reading Trat, 15 April: no reading Trat, 16 April: 30.9 µg/m³ Trat, 17 April: 24.4 µg/m³ Trat, 18 April: no reading Trat, 19 April: no reading Trat, 20 April: 25.4 µg/m³ Trat, 21 April: 37.6 µg/m³, 2.1× its usual 17.6 Trat, 22 April: no reading Trat, 23 April: no reading Trat, 24 April: 17.7 µg/m³ 11 Apr 13 15 17 19 21 23 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. Good 0–50
Moderate 51–100
Sensitive groups 101–150
Unhealthy 151–200
Very unhealthy 201–300
Hazardous 301+
Every city it reached
City Days Highest Usual Above usual
Samut Prakan Samut Prakan, Thailand 8 16 April 18.9 3.3× Hua Hin Prachuap Khiri Khan, Thailand 4 16 April 21.2 3.0× Laem Chabang Chon Buri, Thailand 4 16 April 17.8 3.0× Chanthaburi Chanthaburi, Thailand 4 21 April 15.7 3.0× Nakhon Pathom Nakhon Pathom, Thailand 8 16 April 22.0 2.9× Rayong Rayong, Thailand 4 16 April 17.3 2.9× Ban Samae Dam Bangkok, Thailand 4 16 April 23.2 2.7× Bueng Kum Bangkok, Thailand 4 16 April 21.2 2.7× Samut Sakhon Samut Sakhon, Thailand 8 16 April 20.7 2.7× Ban Khlong Prawet Bangkok, Thailand 4 16 April 20.0 2.7× Nong Khaem Bangkok, Thailand 6 16 April 24.2 2.6× Bangkok Bangkok, Thailand 8 16 April 22.7 2.6× Ban Chang Rayong, Thailand 4 16 April 21.3 2.6× Lak Si Bangkok, Thailand 4 16 April 23.5 2.5× Phra Pradaeng Samut Prakan, Thailand 5 16 April 21.9 2.5× Mueang Nonthaburi Nonthaburi, Thailand 5 16 April 22.0 2.5× Ban Talat Bueng Chon Buri, Thailand 4 16 April 20.6 2.5× Ratchaburi Ratchaburi, Thailand 2 16 April 29.6 2.4× Bang Na Bangkok, Thailand 4 16 April 27.5 2.4× Saphan Sung Bangkok, Thailand 3 16 April 24.0 2.4× Bang Kapi Bangkok, Thailand 5 16 April 22.7 2.4× Sai Mai Bangkok, Thailand 3 16 April 23.2 2.4× Lat Krabang Bangkok, Thailand 4 16 April 23.0 2.4× Nong Chok Bangkok, Thailand 4 16 April 23.0 2.4× Chai Nat Chai Nat, Thailand 2 17 April 40.3 2.3× Suphan Buri Suphan Buri, Thailand 3 17 April 33.7 2.3× Khan Na Yao Bangkok, Thailand 4 16 April 24.8 2.3× Bang Bo District Samut Prakan, Thailand 3 16 April 21.4 2.3× Sing Buri Sing Buri, Thailand 2 16 April 38.0 2.2× Phra Nakhon Si Ayutthaya Phra Nakhon Si Ayutthaya, Thailand 3 16 April 27.7 2.2× Khlong Sam Wa Bangkok, Thailand 3 16 April 26.8 2.2× Aranyaprathet Sa Kaeo, Thailand 1 21 April 17.9 2.2× Lop Buri Lopburi, Thailand 2 16 April 35.0 2.1× Trat Trat, Thailand 1 21 April 17.6 2.1× Khlong Luang Pathum Thani, Thailand 1 16 April 26.2 2.0×
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 6 of 23 episodes in Thailand since our records began, by cities reached.
Thailand and Laos, March 2025 53 Thailand, February 2024 51 Thailand, January 2025 50 Thailand and Laos, April and May 2024 45 Northern Thailand and Laos, 20 to 22 May 2023 41 Thailand, April 2023 35 Thailand and Laos, January and February 2023 34 Northern Thailand and Laos, 16 to 18 May 2023 30 Northern Thailand and Laos, October 2024 24 Thailand and Laos, November and December 2025 22 Thailand, February 2025 17 Northern Thailand, May 2023 17 Bars: cities reached; colour: the level of the episode's highest daily reading. All 23 .
Use this page SmogRank, Thailand, April 2023: 35 cities with PM2.5 at twice their usual or more, 14 to 21 April 2023, smogrank.com/episodes/2023-04-thailand (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.
