SmogRank / Episodes / Thailand
Thailand, February 2025
For 2 days, from 12 to 13 February 2025, 17 cities in Thailand had PM2.5 at least twice their usual for the time of year. The worst reading was Samut Sakhon, Samut Sakhon, Thailand: 87.9 µg/m³ on 12 February, about 2.8× its usual 31.7.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 17 in 1 country
Days 2 12 to 13 February 2025
Worst day 13 February 14 cities counted
Furthest above usual 2.8× Samut Sakhon
Day by day
Play 13 February 14 cities at twice their usual or more
Hua Hin Ranong Trat Phetchaburi Bang Pakong Bang Bo District Ban Samae Dam Ratchaburi Nong Khaem Lat Krabang Bangkok Bang Kapi Mueang Nonthaburi Khlong Sam Wa Nakhon Pathom Lak Si Sai Mai Khlong Luang Trang Si Maha Phot Prachin Buri Kanchanaburi Aranyaprathet Nakhon Nayok Phra Nakhon Si Ayutthaya Chumphon Ban Khlong Prawet Saphan Sung Bueng Kum Bang Na Samut Prakan Ban Phaeo Khan Na Yao Phatthalung Chanthaburi Rayong Ban Chang Phra Pradaeng Nong Chok Laem Chabang Ban Talat Bueng Samut Sakhon 9 Feb 10 11 12 13 14 15 16 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
Samut Sakhon Samut Sakhon, 9 February: no reading Samut Sakhon, 10 February: 34.3 µg/m³ Samut Sakhon, 11 February: 55.9 µg/m³ Samut Sakhon, 12 February: 87.9 µg/m³, 2.8× its usual 31.7 Samut Sakhon, 13 February: 65.0 µg/m³, 2.0× its usual 32.0 Samut Sakhon, 14 February: 38.6 µg/m³ Samut Sakhon, 15 February: 36.1 µg/m³ Samut Sakhon, 16 February: 39.2 µg/m³ Phra Pradaeng Phra Pradaeng, 9 February: 29.9 µg/m³ Phra Pradaeng, 10 February: 25.2 µg/m³ Phra Pradaeng, 11 February: 35.6 µg/m³ Phra Pradaeng, 12 February: 65.9 µg/m³, 2.3× its usual 28.8 Phra Pradaeng, 13 February: 66.2 µg/m³, 2.4× its usual 28.1 Phra Pradaeng, 14 February: 45.7 µg/m³ Phra Pradaeng, 15 February: 40.3 µg/m³ Phra Pradaeng, 16 February: 43.9 µg/m³ Ban Phaeo Ban Phaeo, 9 February: no reading Ban Phaeo, 10 February: no reading Ban Phaeo, 11 February: 39.0 µg/m³ Ban Phaeo, 12 February: 65.2 µg/m³, 2.2× its usual 30.1 Ban Phaeo, 13 February: 59.9 µg/m³ Ban Phaeo, 14 February: 41.7 µg/m³ Ban Phaeo, 15 February: 35.9 µg/m³ Ban Phaeo, 16 February: 39.4 µg/m³ Rayong Rayong, 9 February: 34.8 µg/m³ Rayong, 10 February: 33.8 µg/m³ Rayong, 11 February: 33.6 µg/m³ Rayong, 12 February: 59.0 µg/m³, 2.4× its usual 24.1 Rayong, 13 February: 54.3 µg/m³, 2.3× its usual 24.1 Rayong, 14 February: 41.2 µg/m³ Rayong, 15 February: 27.2 µg/m³ Rayong, 16 February: 22.2 µg/m³ Ban Chang Ban Chang, 9 February: 38.0 µg/m³ Ban Chang, 10 February: 24.0 µg/m³ Ban Chang, 11 February: 36.5 µg/m³ Ban Chang, 12 February: 54.5 µg/m³, 2.1× its usual 26.3 Ban Chang, 13 February: 63.8 µg/m³, 2.4× its usual 26.3 Ban Chang, 14 February: 47.1 µg/m³ Ban Chang, 15 February: 36.0 µg/m³ Ban Chang, 16 February: 30.4 µg/m³ Samut Prakan Samut Prakan, 9 February: 27.5 µg/m³ Samut Prakan, 10 February: 24.2 µg/m³ Samut Prakan, 11 February: 30.0 µg/m³ Samut Prakan, 12 February: 52.2 µg/m³, 2.2× its usual 24.0 Samut Prakan, 13 February: 52.5 µg/m³, 2.2× its usual 24.1 Samut Prakan, 14 February: 34.8 µg/m³ Samut Prakan, 15 February: 26.9 µg/m³ Samut Prakan, 16 February: 30.3 µg/m³ Laem Chabang Laem Chabang, 9 February: 32.0 µg/m³ Laem Chabang, 10 February: 21.6 µg/m³ Laem Chabang, 11 February: 29.8 µg/m³ Laem Chabang, 12 February: 49.6 µg/m³, 2.0× its usual 24.3 Laem Chabang, 13 February: 65.0 µg/m³, 2.7× its usual 24.3 Laem Chabang, 14 February: 44.5 µg/m³ Laem Chabang, 15 February: 37.3 µg/m³ Laem Chabang, 16 February: 32.4 µg/m³ Chanthaburi Chanthaburi, 9 February: 39.1 µg/m³ Chanthaburi, 10 February: 35.3 µg/m³ Chanthaburi, 11 February: 43.6 µg/m³ Chanthaburi, 12 February: 46.1 µg/m³, 2.0× its usual 22.7 Chanthaburi, 13 February: 55.6 µg/m³, 2.4× its usual 22.7 Chanthaburi, 14 February: 48.8 µg/m³ Chanthaburi, 15 February: 38.2 µg/m³ Chanthaburi, 16 February: 31.0 µg/m³ Chumphon Chumphon, 9 February: 28.4 µg/m³ Chumphon, 10 February: 30.4 µg/m³ Chumphon, 11 February: 26.0 µg/m³ Chumphon, 12 February: 39.0 µg/m³, 2.0× its usual 19.4 Chumphon, 13 February: 39.0 µg/m³ Chumphon, 14 February: 37.2 µg/m³ Chumphon, 15 February: 28.2 µg/m³ Chumphon, 16 February: 22.1 µg/m³ Phatthalung Phatthalung, 9 February: 14.7 µg/m³ Phatthalung, 10 February: 19.2 µg/m³ Phatthalung, 11 February: 24.5 µg/m³ Phatthalung, 12 February: 28.6 µg/m³, 2.3× its usual 12.7 Phatthalung, 13 February: 28.5 µg/m³ Phatthalung, 14 February: 19.3 µg/m³ Phatthalung, 15 February: 17.6 µg/m³ Phatthalung, 16 February: 23.6 µg/m³ Ban Talat Bueng Ban Talat Bueng, 9 February: 35.7 µg/m³ Ban Talat Bueng, 10 February: 28.4 µg/m³ Ban Talat Bueng, 11 February: 46.4 µg/m³ Ban Talat Bueng, 12 February: 59.8 µg/m³ Ban Talat Bueng, 13 February: 81.9 µg/m³, 2.7× its usual 30.9 Ban Talat Bueng, 14 February: 58.7 µg/m³ Ban Talat Bueng, 15 February: 43.5 µg/m³ Ban Talat Bueng, 16 February: 44.1 µg/m³ Nong Chok Nong Chok, 9 February: 27.5 µg/m³ Nong Chok, 10 February: 28.0 µg/m³ Nong Chok, 11 February: 38.1 µg/m³ Nong Chok, 12 February: 59.8 µg/m³ Nong Chok, 13 February: 80.2 µg/m³, 2.6× its usual 31.1 Nong Chok, 14 February: 59.1 µg/m³ Nong Chok, 15 February: 47.5 µg/m³ Nong Chok, 16 February: 52.1 µg/m³ Khan Na Yao Khan Na Yao, 9 February: 28.7 µg/m³ Khan Na Yao, 10 February: 29.7 µg/m³ Khan Na Yao, 11 February: 38.7 µg/m³ Khan Na Yao, 12 February: 68.4 µg/m³ Khan Na Yao, 13 February: 77.1 µg/m³, 2.2× its usual 34.8 Khan Na Yao, 14 February: 57.9 µg/m³ Khan Na Yao, 15 February: 47.0 µg/m³ Khan Na Yao, 16 February: 48.1 µg/m³ Bang Na Bang Na, 9 February: 29.0 µg/m³ Bang Na, 10 February: 29.2 µg/m³ Bang Na, 11 February: 42.5 µg/m³ Bang Na, 12 February: 71.4 µg/m³ Bang Na, 13 February: 74.3 µg/m³, 2.1× its usual 36.1 Bang Na, 14 February: 61.5 µg/m³ Bang Na, 15 February: 49.3 µg/m³ Bang Na, 16 February: 50.8 µg/m³ Bueng Kum Bueng Kum, 9 February: 29.0 µg/m³ Bueng Kum, 10 February: 25.3 µg/m³ Bueng Kum, 11 February: 34.2 µg/m³ Bueng Kum, 12 February: 58.0 µg/m³ Bueng Kum, 13 February: 70.9 µg/m³, 2.1× its usual 33.1 Bueng Kum, 14 February: 53.1 µg/m³ Bueng Kum, 15 February: 42.5 µg/m³ Bueng Kum, 16 February: 44.3 µg/m³ Saphan Sung Saphan Sung, 9 February: 30.4 µg/m³ Saphan Sung, 10 February: 28.4 µg/m³ Saphan Sung, 11 February: 38.1 µg/m³ Saphan Sung, 12 February: 60.6 µg/m³ Saphan Sung, 13 February: 67.2 µg/m³, 2.1× its usual 32.0 Saphan Sung, 14 February: 51.4 µg/m³ Saphan Sung, 15 February: 41.6 µg/m³ Saphan Sung, 16 February: 43.5 µg/m³ Ban Khlong Prawet Ban Khlong Prawet, 9 February: 25.1 µg/m³ Ban Khlong Prawet, 10 February: 23.5 µg/m³ Ban Khlong Prawet, 11 February: 32.6 µg/m³ Ban Khlong Prawet, 12 February: 55.2 µg/m³ Ban Khlong Prawet, 13 February: 60.4 µg/m³, 2.1× its usual 29.0 Ban Khlong Prawet, 14 February: 44.9 µg/m³ Ban Khlong Prawet, 15 February: 36.5 µg/m³ Ban Khlong Prawet, 16 February: 38.3 µg/m³ 9 Feb 10 11 12 13 14 15 16 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 Sakhon Samut Sakhon, Thailand 2 12 February 31.7 2.8× Ban Talat Bueng Chon Buri, Thailand 1 13 February 30.9 2.7× Laem Chabang Chon Buri, Thailand 2 13 February 24.3 2.7× Nong Chok Bangkok, Thailand 1 13 February 31.1 2.6× Phra Pradaeng Samut Prakan, Thailand 2 13 February 28.1 2.4× Ban Chang Rayong, Thailand 2 13 February 26.3 2.4× Rayong Rayong, Thailand 2 12 February 24.1 2.4× Chanthaburi Chanthaburi, Thailand 2 13 February 22.7 2.4× Phatthalung Phatthalung, Thailand 1 12 February 12.7 2.3× Khan Na Yao Bangkok, Thailand 1 13 February 34.8 2.2× Ban Phaeo Samut Sakhon, Thailand 1 12 February 30.1 2.2× Samut Prakan Samut Prakan, Thailand 2 13 February 24.1 2.2× Bang Na Bangkok, Thailand 1 13 February 36.1 2.1× Bueng Kum Bangkok, Thailand 1 13 February 33.1 2.1× Saphan Sung Bangkok, Thailand 1 13 February 32.0 2.1× Ban Khlong Prawet Bangkok, Thailand 1 13 February 29.0 2.1× Chumphon Chumphon, Thailand 1 12 February 19.4 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 11 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, February 2025: 17 cities with PM2.5 at twice their usual or more, 12 to 13 February 2025, smogrank.com/episodes/2025-02-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.
