SmogRank / Episodes / Thailand
North-eastern Thailand, October 2024
For 1 day, on 6 October 2024, 24 cities in Thailand and Laos had PM2.5 at least twice their usual for the time of year. The worst reading was Kanchanaburi, Kanchanaburi, Thailand: 45.4 µg/m³ on 6 October, about 3.7× its usual 12.3.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 24 in 2 countries
Days 1 6 October 2024
Worst day 6 October 24 cities counted
Furthest above usual 4.9× Ubon Ratchathani
Day by day
Play 6 October 24 cities at twice their usual or more
Phetchabun Nong Bua Lamphu Phichit Saraburi Nakhon Sawan Nakhon Nayok Si Maha Phot Si Sa Ket Phra Nakhon Si Ayutthaya Aranyaprathet Sukhothai Nong Chok Pakxan Suphan Buri Kamphaeng Phet Khlong Sam Wa Sai Mai Khan Na Yao Lak Si Lat Krabang Bueng Kum Saphan Sung Bang Kapi Phrae Ban Khlong Prawet Bang Bo District Bang Na Bangkok Phra Pradaeng Samut Prakan Lampang Mae Sot Phayao Lamphun Chiang Mai Khlong Luang Tha Bo Ban Samae Dam Sing Buri Vientiane Mueang Nonthaburi Amnat Charoen Nakhon Ratchasima Samut Sakhon Nan Nong Khaem Kalasin Udon Thani Ratchaburi Nakhon Pathom Yasothon Chaiyaphum Mukdahan Lop Buri Kanchanaburi Sakon Nakhon Surin Buri Ram Ubon Ratchathani 3 Oct 4 5 6 7 8 9 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, 3 October: 13.5 µg/m³, 0.8× usual Samut Sakhon, 4 October: no reading Samut Sakhon, 5 October: 39.0 µg/m³, 2.3× usual Samut Sakhon, 6 October: 41.0 µg/m³, 2.4× usual Samut Sakhon, 7 October: 35.5 µg/m³, 2.1× usual Samut Sakhon, 8 October: 50.6 µg/m³, 2.9× usual Samut Sakhon, 9 October: 38.7 µg/m³, 2.2× usual Nakhon Pathom Nakhon Pathom, 3 October: 9.8 µg/m³, 0.8× usual Nakhon Pathom, 4 October: no reading Nakhon Pathom, 5 October: 27.0 µg/m³, 2.1× usual Nakhon Pathom, 6 October: 36.0 µg/m³, 2.8× usual Nakhon Pathom, 7 October: 27.2 µg/m³, 2.1× usual Nakhon Pathom, 8 October: 41.5 µg/m³, 3.2× usual Nakhon Pathom, 9 October: 28.8 µg/m³, 2.2× usual Kanchanaburi Kanchanaburi, 3 October: no reading Kanchanaburi, 4 October: no reading Kanchanaburi, 5 October: no reading Kanchanaburi, 6 October: 45.4 µg/m³, 3.7× usual Kanchanaburi, 7 October: no reading Kanchanaburi, 8 October: no reading Kanchanaburi, 9 October: no reading Nong Khaem Nong Khaem, 3 October: 10.9 µg/m³, 0.6× usual Nong Khaem, 4 October: 14.2 µg/m³, 0.8× usual Nong Khaem, 5 October: 20.7 µg/m³, 1.2× usual Nong Khaem, 6 October: 43.1 µg/m³, 2.5× usual Nong Khaem, 7 October: 28.2 µg/m³, 1.6× usual Nong Khaem, 8 October: 39.9 µg/m³, 2.3× usual Nong Khaem, 9 October: 24.1 µg/m³, 1.4× usual Vientiane Vientiane, 3 October: 12.0 µg/m³, 0.7× usual Vientiane, 4 October: 17.4 µg/m³, 1.1× usual Vientiane, 5 October: 31.5 µg/m³, 1.9× usual Vientiane, 6 October: 37.8 µg/m³, 2.3× usual Vientiane, 7 October: 44.0 µg/m³, 2.7× usual Vientiane, 8 October: 35.7 µg/m³, 2.2× usual Vientiane, 9 October: 42.9 µg/m³, 2.6× usual Tha Bo Tha Bo, 3 October: 12.0 µg/m³, 0.7× usual Tha Bo, 4 October: 17.4 µg/m³, 1.0× usual Tha Bo, 5 October: 31.5 µg/m³, 1.8× usual Tha Bo, 6 October: 37.8 µg/m³, 2.1× usual Tha Bo, 7 October: 44.0 µg/m³, 2.5× usual Tha Bo, 8 October: 35.7 µg/m³, 2.0× usual Tha Bo, 9 October: 42.9 µg/m³, 2.4× usual Sing Buri Sing Buri, 3 October: no reading Sing Buri, 4 October: no reading Sing Buri, 5 October: no reading Sing Buri, 6 October: 36.2 µg/m³, 2.2× usual Sing Buri, 7 October: no reading Sing Buri, 8 October: no reading Sing Buri, 9 October: no reading Ban Samae Dam Ban Samae Dam, 3 October: 14.5 µg/m³, 0.9× usual Ban Samae Dam, 4 October: 15.1 µg/m³, 0.9× usual Ban Samae Dam, 5 October: 24.4 µg/m³, 1.5× usual Ban Samae Dam, 6 October: 36.1 µg/m³, 2.2× usual Ban Samae Dam, 7 October: 30.1 µg/m³, 1.8× usual Ban Samae Dam, 8 October: 41.0 µg/m³, 2.5× usual Ban Samae Dam, 9 October: 27.9 µg/m³, 1.7× usual Mukdahan Mukdahan, 3 October: no reading Mukdahan, 4 October: no reading Mukdahan, 5 October: no reading Mukdahan, 6 October: 34.9 µg/m³, 3.3× usual Mukdahan, 7 October: no reading Mukdahan, 8 October: no reading Mukdahan, 9 October: no reading Kalasin Kalasin, 3 October: no reading Kalasin, 4 October: no reading Kalasin, 5 October: no reading Kalasin, 6 October: 34.3 µg/m³, 2.6× usual Kalasin, 7 October: no reading Kalasin, 8 October: no reading Kalasin, 9 October: no reading Ubon Ratchathani Ubon Ratchathani, 3 October: no reading Ubon Ratchathani, 4 October: no reading Ubon Ratchathani, 5 October: no reading Ubon Ratchathani, 6 October: 34.0 µg/m³, 4.9× usual Ubon Ratchathani, 7 October: no reading Ubon Ratchathani, 8 October: no reading Ubon Ratchathani, 9 October: no reading Yasothon Yasothon, 3 October: no reading Yasothon, 4 October: no reading Yasothon, 5 October: no reading Yasothon, 6 October: 31.5 µg/m³, 3.0× usual Yasothon, 7 October: no reading Yasothon, 8 October: no reading Yasothon, 9 October: no reading Khlong Luang Khlong Luang, 3 October: 15.0 µg/m³, 1.0× usual Khlong Luang, 4 October: no reading Khlong Luang, 5 October: 18.3 µg/m³, 1.2× usual Khlong Luang, 6 October: 31.2 µg/m³, 2.0× usual Khlong Luang, 7 October: 26.5 µg/m³, 1.7× usual Khlong Luang, 8 October: 27.2 µg/m³, 1.8× usual Khlong Luang, 9 October: 19.9 µg/m³, 1.3× usual Nakhon Ratchasima Nakhon Ratchasima, 3 October: no reading Nakhon Ratchasima, 4 October: no reading Nakhon Ratchasima, 5 October: no reading Nakhon Ratchasima, 6 October: 29.7 µg/m³, 2.4× usual Nakhon Ratchasima, 7 October: no reading Nakhon Ratchasima, 8 October: no reading Nakhon Ratchasima, 9 October: no reading Amnat Charoen Amnat Charoen, 3 October: no reading Amnat Charoen, 4 October: no reading Amnat Charoen, 5 October: no reading Amnat Charoen, 6 October: 29.7 µg/m³, 2.4× usual Amnat Charoen, 7 October: no reading Amnat Charoen, 8 October: no reading Amnat Charoen, 9 October: no reading Sakon Nakhon Sakon Nakhon, 3 October: no reading Sakon Nakhon, 4 October: no reading Sakon Nakhon, 5 October: no reading Sakon Nakhon, 6 October: 28.9 µg/m³, 4.1× usual Sakon Nakhon, 7 October: no reading Sakon Nakhon, 8 October: no reading Sakon Nakhon, 9 October: no reading Ratchaburi Ratchaburi, 3 October: no reading Ratchaburi, 4 October: no reading Ratchaburi, 5 October: no reading Ratchaburi, 6 October: 28.6 µg/m³, 2.6× usual Ratchaburi, 7 October: no reading Ratchaburi, 8 October: no reading Ratchaburi, 9 October: no reading Lop Buri Lop Buri, 3 October: no reading Lop Buri, 4 October: no reading Lop Buri, 5 October: no reading Lop Buri, 6 October: 28.5 µg/m³, 3.5× usual Lop Buri, 7 October: no reading Lop Buri, 8 October: no reading Lop Buri, 9 October: no reading Nan Nan, 3 October: no reading Nan, 4 October: no reading Nan, 5 October: no reading Nan, 6 October: 28.5 µg/m³, 2.5× usual Nan, 7 October: no reading Nan, 8 October: no reading Nan, 9 October: no reading Buri Ram Buri Ram, 3 October: no reading Buri Ram, 4 October: no reading Buri Ram, 5 October: no reading Buri Ram, 6 October: 27.2 µg/m³, 4.5× usual Buri Ram, 7 October: no reading Buri Ram, 8 October: no reading Buri Ram, 9 October: no reading Udon Thani Udon Thani, 3 October: no reading Udon Thani, 4 October: no reading Udon Thani, 5 October: no reading Udon Thani, 6 October: 26.6 µg/m³, 2.6× usual Udon Thani, 7 October: no reading Udon Thani, 8 October: no reading Udon Thani, 9 October: no reading Surin Surin, 3 October: no reading Surin, 4 October: no reading Surin, 5 October: no reading Surin, 6 October: 26.2 µg/m³, 4.2× usual Surin, 7 October: no reading Surin, 8 October: no reading Surin, 9 October: no reading Mueang Nonthaburi Mueang Nonthaburi, 3 October: 8.8 µg/m³, 0.8× usual Mueang Nonthaburi, 4 October: 6.3 µg/m³, 0.6× usual Mueang Nonthaburi, 5 October: 15.6 µg/m³, 1.4× usual Mueang Nonthaburi, 6 October: 26.2 µg/m³, 2.3× usual Mueang Nonthaburi, 7 October: 26.4 µg/m³, 2.3× usual Mueang Nonthaburi, 8 October: 34.0 µg/m³, 3.0× usual Mueang Nonthaburi, 9 October: 17.5 µg/m³, 1.5× usual Chaiyaphum Chaiyaphum, 3 October: no reading Chaiyaphum, 4 October: no reading Chaiyaphum, 5 October: no reading Chaiyaphum, 6 October: 25.5 µg/m³, 3.1× usual Chaiyaphum, 7 October: no reading Chaiyaphum, 8 October: no reading Chaiyaphum, 9 October: no reading 3 Oct 4 5 6 7 8 9 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
Ubon Ratchathani Ubon Ratchathani, Thailand 1 6 October 7.0 4.9× Buri Ram Buriram, Thailand 1 6 October 6.1 4.5× Surin Surin, Thailand 1 6 October 6.3 4.2× Sakon Nakhon Sakon Nakhon, Thailand 1 6 October 7.0 4.1× Kanchanaburi Kanchanaburi, Thailand 1 6 October 12.3 3.7× Lop Buri Lopburi, Thailand 1 6 October 8.2 3.5× Mukdahan Mukdahan, Thailand 1 6 October 10.6 3.3× Nakhon Pathom Nakhon Pathom, Thailand 1 8 October 12.9 3.2× Chaiyaphum Chaiyaphum, Thailand 1 6 October 8.2 3.1× Yasothon Yasothon, Thailand 1 6 October 10.4 3.0× Mueang Nonthaburi Nonthaburi, Thailand 1 8 October 11.4 3.0× Samut Sakhon Samut Sakhon, Thailand 1 8 October 17.3 2.9× Vientiane Vientiane Prefecture, Laos 1 7 October 16.2 2.7× Udon Thani Udon Thani, Thailand 1 6 October 10.1 2.6× Ratchaburi Ratchaburi, Thailand 1 6 October 10.9 2.6× Kalasin Kalasin, Thailand 1 6 October 13.3 2.6× Nan Nan, Thailand 1 6 October 11.2 2.5× Tha Bo Nong Khai, Thailand 1 7 October 17.8 2.5× Nong Khaem Bangkok, Thailand 1 6 October 17.5 2.5× Ban Samae Dam Bangkok, Thailand 1 8 October 16.7 2.5× Amnat Charoen Amnat Charoen, Thailand 1 6 October 12.3 2.4× Nakhon Ratchasima Nakhon Ratchasima, Thailand 1 6 October 12.5 2.4× Sing Buri Sing Buri, Thailand 1 6 October 16.1 2.2× Khlong Luang Pathum Thani, Thailand 1 6 October 15.3 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 and Laos
Number 9 of 24 episodes in Thailand and Laos since our records began, by cities reached.
Central Thailand, March 2025 53 Western Thailand, February 2024 51 Central Thailand, January 2025 50 North-western Thailand, April and May 2024 45 North-western Thailand, May 2023 41 Western Thailand, April 2023 35 Western Thailand and Laos, January and February 2023 34 North-western Thailand, May 2023 30 North-eastern Thailand, October 2024 24 Northern Thailand, November and December 2025 22 Western Thailand, February 2025 17 North-western Thailand, May 2023 17 Bars: cities reached; colour: the level of the episode's highest daily reading. All 24 .
Use this page SmogRank, North-eastern Thailand, October 2024: 24 cities with PM2.5 at twice their usual or more, 6 October 2024, smogrank.com/episodes/2024-10-north-eastern-thailand (accessed 3 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.
