SmogRank / Episodes / Thailand
Western 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 Saphan Sung Bueng Kum Bang Na Ban Khlong Prawet Khan Na Yao Ban Phaeo Samut Prakan Phatthalung Ban Chang Chanthaburi Phra Pradaeng Rayong Nong Chok Ban Talat Bueng Laem Chabang 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, 1.1× usual Samut Sakhon, 11 February: 55.9 µg/m³, 1.8× usual Samut Sakhon, 12 February: 87.9 µg/m³, 2.8× usual Samut Sakhon, 13 February: 65.0 µg/m³, 2.1× usual Samut Sakhon, 14 February: 38.6 µg/m³, 1.2× usual Samut Sakhon, 15 February: 36.1 µg/m³, 1.1× usual Samut Sakhon, 16 February: 39.2 µg/m³, 1.2× usual Phra Pradaeng Phra Pradaeng, 9 February: 29.9 µg/m³, 1.1× usual Phra Pradaeng, 10 February: 25.2 µg/m³, 0.9× usual Phra Pradaeng, 11 February: 35.6 µg/m³, 1.3× usual Phra Pradaeng, 12 February: 65.9 µg/m³, 2.3× usual Phra Pradaeng, 13 February: 66.2 µg/m³, 2.4× usual Phra Pradaeng, 14 February: 45.7 µg/m³, 1.6× usual Phra Pradaeng, 15 February: 40.3 µg/m³, 1.4× usual Phra Pradaeng, 16 February: 43.9 µg/m³, 1.6× usual Ban Phaeo Ban Phaeo, 9 February: no reading Ban Phaeo, 10 February: no reading Ban Phaeo, 11 February: 39.0 µg/m³, 1.3× usual Ban Phaeo, 12 February: 65.2 µg/m³, 2.2× usual Ban Phaeo, 13 February: 59.9 µg/m³, 2.0× usual Ban Phaeo, 14 February: 41.7 µg/m³, 1.4× usual Ban Phaeo, 15 February: 35.9 µg/m³, 1.2× usual Ban Phaeo, 16 February: 39.4 µg/m³, 1.3× usual Rayong Rayong, 9 February: 34.8 µg/m³, 1.4× usual Rayong, 10 February: 33.8 µg/m³, 1.4× usual Rayong, 11 February: 33.6 µg/m³, 1.4× usual Rayong, 12 February: 59.0 µg/m³, 2.4× usual Rayong, 13 February: 54.3 µg/m³, 2.3× usual Rayong, 14 February: 41.2 µg/m³, 1.7× usual Rayong, 15 February: 27.2 µg/m³, 1.1× usual Rayong, 16 February: 22.2 µg/m³, 0.9× usual Ban Chang Ban Chang, 9 February: 38.0 µg/m³, 1.4× usual Ban Chang, 10 February: 24.0 µg/m³, 0.9× usual Ban Chang, 11 February: 36.5 µg/m³, 1.4× usual Ban Chang, 12 February: 54.5 µg/m³, 2.1× usual Ban Chang, 13 February: 63.8 µg/m³, 2.4× usual Ban Chang, 14 February: 47.1 µg/m³, 1.8× usual Ban Chang, 15 February: 36.0 µg/m³, 1.4× usual Ban Chang, 16 February: 30.4 µg/m³, 1.2× usual Samut Prakan Samut Prakan, 9 February: 27.5 µg/m³, 1.1× usual Samut Prakan, 10 February: 24.2 µg/m³, 1.0× usual Samut Prakan, 11 February: 30.0 µg/m³, 1.2× usual Samut Prakan, 12 February: 52.2 µg/m³, 2.2× usual Samut Prakan, 13 February: 52.5 µg/m³, 2.2× usual Samut Prakan, 14 February: 34.8 µg/m³, 1.4× usual Samut Prakan, 15 February: 26.9 µg/m³, 1.1× usual Samut Prakan, 16 February: 30.3 µg/m³, 1.3× usual Laem Chabang Laem Chabang, 9 February: 32.0 µg/m³, 1.3× usual Laem Chabang, 10 February: 21.6 µg/m³, 0.9× usual Laem Chabang, 11 February: 29.8 µg/m³, 1.2× usual Laem Chabang, 12 February: 49.6 µg/m³, 2.0× usual Laem Chabang, 13 February: 65.0 µg/m³, 2.7× usual Laem Chabang, 14 February: 44.5 µg/m³, 1.8× usual Laem Chabang, 15 February: 37.3 µg/m³, 1.5× usual Laem Chabang, 16 February: 32.4 µg/m³, 1.3× usual Chanthaburi Chanthaburi, 9 February: 39.1 µg/m³, 1.7× usual Chanthaburi, 10 February: 35.3 µg/m³, 1.6× usual Chanthaburi, 11 February: 43.6 µg/m³, 1.9× usual Chanthaburi, 12 February: 46.1 µg/m³, 2.0× usual Chanthaburi, 13 February: 55.6 µg/m³, 2.4× usual Chanthaburi, 14 February: 48.8 µg/m³, 2.1× usual Chanthaburi, 15 February: 38.2 µg/m³, 1.7× usual Chanthaburi, 16 February: 31.0 µg/m³, 1.4× usual Chumphon Chumphon, 9 February: 28.4 µg/m³, 1.5× usual Chumphon, 10 February: 30.4 µg/m³, 1.6× usual Chumphon, 11 February: 26.0 µg/m³, 1.3× usual Chumphon, 12 February: 39.0 µg/m³, 2.0× usual Chumphon, 13 February: 39.0 µg/m³, 2.0× usual Chumphon, 14 February: 37.2 µg/m³, 1.9× usual Chumphon, 15 February: 28.2 µg/m³, 1.5× usual Chumphon, 16 February: 22.1 µg/m³, 1.1× usual Phatthalung Phatthalung, 9 February: 14.7 µg/m³, 1.2× usual Phatthalung, 10 February: 19.2 µg/m³, 1.5× usual Phatthalung, 11 February: 24.5 µg/m³, 1.9× usual Phatthalung, 12 February: 28.6 µg/m³, 2.3× usual Phatthalung, 13 February: 28.5 µg/m³, 2.2× usual Phatthalung, 14 February: 19.3 µg/m³, 1.5× usual Phatthalung, 15 February: 17.6 µg/m³, 1.4× usual Phatthalung, 16 February: 23.6 µg/m³, 1.9× usual Ban Talat Bueng Ban Talat Bueng, 9 February: 35.7 µg/m³, 1.2× usual Ban Talat Bueng, 10 February: 28.4 µg/m³, 0.9× usual Ban Talat Bueng, 11 February: 46.4 µg/m³, 1.5× usual Ban Talat Bueng, 12 February: 59.8 µg/m³, 1.9× usual Ban Talat Bueng, 13 February: 81.9 µg/m³, 2.7× usual Ban Talat Bueng, 14 February: 58.7 µg/m³, 1.9× usual Ban Talat Bueng, 15 February: 43.5 µg/m³, 1.4× usual Ban Talat Bueng, 16 February: 44.1 µg/m³, 1.4× usual Nong Chok Nong Chok, 9 February: 27.5 µg/m³, 0.9× usual Nong Chok, 10 February: 28.0 µg/m³, 0.9× usual Nong Chok, 11 February: 38.1 µg/m³, 1.2× usual Nong Chok, 12 February: 59.8 µg/m³, 1.9× usual Nong Chok, 13 February: 80.2 µg/m³, 2.6× usual Nong Chok, 14 February: 59.1 µg/m³, 1.9× usual Nong Chok, 15 February: 47.5 µg/m³, 1.5× usual Nong Chok, 16 February: 52.1 µg/m³, 1.7× usual Khan Na Yao Khan Na Yao, 9 February: 28.7 µg/m³, 0.8× usual Khan Na Yao, 10 February: 29.7 µg/m³, 0.9× usual Khan Na Yao, 11 February: 38.7 µg/m³, 1.1× usual Khan Na Yao, 12 February: 68.4 µg/m³, 2.0× usual Khan Na Yao, 13 February: 77.1 µg/m³, 2.2× usual Khan Na Yao, 14 February: 57.9 µg/m³, 1.7× usual Khan Na Yao, 15 February: 47.0 µg/m³, 1.4× usual Khan Na Yao, 16 February: 48.1 µg/m³, 1.4× usual Bang Na Bang Na, 9 February: 29.0 µg/m³, 0.8× usual Bang Na, 10 February: 29.2 µg/m³, 0.8× usual Bang Na, 11 February: 42.5 µg/m³, 1.2× usual Bang Na, 12 February: 71.4 µg/m³, 2.0× usual Bang Na, 13 February: 74.3 µg/m³, 2.1× usual Bang Na, 14 February: 61.5 µg/m³, 1.7× usual Bang Na, 15 February: 49.3 µg/m³, 1.4× usual Bang Na, 16 February: 50.8 µg/m³, 1.4× usual Bueng Kum Bueng Kum, 9 February: 29.0 µg/m³, 0.9× usual Bueng Kum, 10 February: 25.3 µg/m³, 0.8× usual Bueng Kum, 11 February: 34.2 µg/m³, 1.0× usual Bueng Kum, 12 February: 58.0 µg/m³, 1.8× usual Bueng Kum, 13 February: 70.9 µg/m³, 2.1× usual Bueng Kum, 14 February: 53.1 µg/m³, 1.6× usual Bueng Kum, 15 February: 42.5 µg/m³, 1.3× usual Bueng Kum, 16 February: 44.3 µg/m³, 1.3× usual Saphan Sung Saphan Sung, 9 February: 30.4 µg/m³, 1.0× usual Saphan Sung, 10 February: 28.4 µg/m³, 0.9× usual Saphan Sung, 11 February: 38.1 µg/m³, 1.2× usual Saphan Sung, 12 February: 60.6 µg/m³, 1.9× usual Saphan Sung, 13 February: 67.2 µg/m³, 2.1× usual Saphan Sung, 14 February: 51.4 µg/m³, 1.6× usual Saphan Sung, 15 February: 41.6 µg/m³, 1.3× usual Saphan Sung, 16 February: 43.5 µg/m³, 1.4× usual Ban Khlong Prawet Ban Khlong Prawet, 9 February: 25.1 µg/m³, 0.9× usual Ban Khlong Prawet, 10 February: 23.5 µg/m³, 0.8× usual Ban Khlong Prawet, 11 February: 32.6 µg/m³, 1.1× usual Ban Khlong Prawet, 12 February: 55.2 µg/m³, 1.9× usual Ban Khlong Prawet, 13 February: 60.4 µg/m³, 2.1× usual Ban Khlong Prawet, 14 February: 44.9 µg/m³, 1.5× usual Ban Khlong Prawet, 15 February: 36.5 µg/m³, 1.3× usual Ban Khlong Prawet, 16 February: 38.3 µg/m³, 1.3× usual 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× Laem Chabang Chon Buri, Thailand 2 13 February 24.3 2.7× Ban Talat Bueng Chon Buri, Thailand 1 13 February 30.9 2.7× Nong Chok Bangkok, Thailand 1 13 February 31.1 2.6× Chanthaburi Chanthaburi, Thailand 2 13 February 22.7 2.4× Rayong Rayong, Thailand 2 12 February 24.1 2.4× Ban Chang Rayong, Thailand 2 13 February 26.3 2.4× Phra Pradaeng Samut Prakan, Thailand 2 13 February 28.1 2.4× Phatthalung Phatthalung, Thailand 1 12 February 12.7 2.3× Khan Na Yao Bangkok, Thailand 1 13 February 34.8 2.2× Samut Prakan Samut Prakan, Thailand 2 13 February 24.1 2.2× Ban Phaeo Samut Sakhon, Thailand 1 12 February 30.1 2.2× 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× Bang Na Bangkok, Thailand 1 13 February 36.1 2.1× Chumphon Chumphon, Thailand 1 12 February 19.4 2.0×
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 4 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, Western Thailand, February 2025: 17 cities with PM2.5 at twice their usual or more, 12 to 13 February 2025, smogrank.com/episodes/2025-02-western-thailand (accessed 2 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.
