SmogRank / Episodes / Thailand

North-eastern Thailand, February 2025

For 3 days, from 1 to 3 February 2025, 9 cities in Thailand had PM2.5 at least twice their usual for the time of year. The worst reading was Phetchaburi, Phetchaburi, Thailand: 80.1 µg/m³ on 1 February, about 2.0× its usual 39.6.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached9in 1 country
Days31 to 3 February 2025
Worst day1 February7 cities counted
Furthest above usual3.2×Si Sa Ket

Day by day

1 February 7 cities at twice their usual or more
Nakhon RatchasimaAranyaprathetSi Maha PhotChaiyaphumSurinPrachin BuriNakhon NayokSaraburiLop BuriNong ChokNakhon LuangMaha SarakhamKhon KaenPhra Nakhon Si AyutthayaKhlong Sam WaKhlong LuangLat KrabangSai MaiRoi EtKhan Na YaoBang Bo DistrictSaphan SungBueng KumBan Khlong PrawetSing BuriBang KapiLak SiBang NaMueang NonthaburiPhetchabunSamut PrakanKalasinBangkokPhra PradaengChanthaburiLaem ChabangSuphan BuriNong KhaemBan Samae DamChai NatRayongSamut SakhonBan ChangNakhon SawanNakhon PathomBan PhaeoAmnat CharoenUbon RatchathaniPhichitUdon ThaniRatchaburiLoeiKanchanaburiHua HinKamphaeng PhetSukhothaiMae SotMukdahanBan Talat BuengTratPhetchaburiNong Bua LamphuBuri RamSakon NakhonYasothonSi Sa Ket
29 Jan30311 Feb23456
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

TratTrat, 29 January: no readingTrat, 30 January: no readingTrat, 31 January: 72.4 µg/m³, 2.1× usualTrat, 1 February: 69.1 µg/m³, 2.0× usualTrat, 2 February: 77.0 µg/m³, 2.3× usualTrat, 3 February: 57.3 µg/m³, 1.7× usualTrat, 4 February: 45.0 µg/m³, 1.3× usualTrat, 5 February: 45.9 µg/m³, 1.3× usualTrat, 6 February: 42.1 µg/m³, 1.2× usualYasothonYasothon, 29 January: no readingYasothon, 30 January: no readingYasothon, 31 January: 59.3 µg/m³, 2.0× usualYasothon, 1 February: 66.2 µg/m³, 2.3× usualYasothon, 2 February: 70.6 µg/m³, 2.4× usualYasothon, 3 February: 63.6 µg/m³, 2.2× usualYasothon, 4 February: 32.8 µg/m³, 1.1× usualYasothon, 5 February: 28.9 µg/m³, 1.0× usualYasothon, 6 February: 47.7 µg/m³, 1.6× usualPhetchaburiPhetchaburi, 29 January: no readingPhetchaburi, 30 January: no readingPhetchaburi, 31 January: 77.0 µg/m³, 1.9× usualPhetchaburi, 1 February: 80.1 µg/m³, 2.0× usualPhetchaburi, 2 February: 73.1 µg/m³, 1.8× usualPhetchaburi, 3 February: 65.9 µg/m³, 1.7× usualPhetchaburi, 4 February: 55.8 µg/m³, 1.4× usualPhetchaburi, 5 February: 69.9 µg/m³, 1.8× usualPhetchaburi, 6 February: 42.0 µg/m³, 1.1× usualSi Sa KetSi Sa Ket, 29 January: no readingSi Sa Ket, 30 January: no readingSi Sa Ket, 31 January: no readingSi Sa Ket, 1 February: 75.1 µg/m³, 3.2× usualSi Sa Ket, 2 February: 73.5 µg/m³, 3.1× usualSi Sa Ket, 3 February: 72.2 µg/m³, 3.0× usualSi Sa Ket, 4 February: 32.6 µg/m³, 1.4× usualSi Sa Ket, 5 February: 9.6 µg/m³, 0.4× usualSi Sa Ket, 6 February: 30.9 µg/m³, 1.3× usualBan Talat BuengBan Talat Bueng, 29 January: no readingBan Talat Bueng, 30 January: no readingBan Talat Bueng, 31 January: 63.7 µg/m³, 1.9× usualBan Talat Bueng, 1 February: 66.4 µg/m³, 2.0× usualBan Talat Bueng, 2 February: 59.9 µg/m³, 1.8× usualBan Talat Bueng, 3 February: 55.4 µg/m³, 1.7× usualBan Talat Bueng, 4 February: 47.1 µg/m³, 1.4× usualBan Talat Bueng, 5 February: 52.4 µg/m³, 1.6× usualBan Talat Bueng, 6 February: 46.4 µg/m³, 1.4× usualBuri RamBuri Ram, 29 January: no readingBuri Ram, 30 January: no readingBuri Ram, 31 January: 32.4 µg/m³, 1.2× usualBuri Ram, 1 February: 53.9 µg/m³, 2.0× usualBuri Ram, 2 February: 51.6 µg/m³, 1.9× usualBuri Ram, 3 February: 64.0 µg/m³, 2.4× usualBuri Ram, 4 February: 37.7 µg/m³, 1.4× usualBuri Ram, 5 February: 25.5 µg/m³, 1.0× usualBuri Ram, 6 February: 51.8 µg/m³, 1.9× usualSakon NakhonSakon Nakhon, 29 January: no readingSakon Nakhon, 30 January: no readingSakon Nakhon, 31 January: 32.2 µg/m³, 1.6× usualSakon Nakhon, 1 February: 42.1 µg/m³, 2.1× usualSakon Nakhon, 2 February: 48.8 µg/m³, 2.4× usualSakon Nakhon, 3 February: 43.6 µg/m³, 2.2× usualSakon Nakhon, 4 February: 14.9 µg/m³, 0.7× usualSakon Nakhon, 5 February: 9.9 µg/m³, 0.5× usualSakon Nakhon, 6 February: 23.2 µg/m³, 1.2× usualMukdahanMukdahan, 29 January: no readingMukdahan, 30 January: no readingMukdahan, 31 January: 50.1 µg/m³, 1.8× usualMukdahan, 1 February: 51.4 µg/m³, 1.9× usualMukdahan, 2 February: 56.2 µg/m³, 2.0× usualMukdahan, 3 February: 48.8 µg/m³, 1.8× usualMukdahan, 4 February: 19.0 µg/m³, 0.7× usualMukdahan, 5 February: 17.9 µg/m³, 0.6× usualMukdahan, 6 February: 38.9 µg/m³, 1.4× usualNong Bua LamphuNong Bua Lamphu, 29 January: no readingNong Bua Lamphu, 30 January: no readingNong Bua Lamphu, 31 January: 37.1 µg/m³, 1.3× usualNong Bua Lamphu, 1 February: 45.7 µg/m³, 1.5× usualNong Bua Lamphu, 2 February: 49.8 µg/m³, 1.7× usualNong Bua Lamphu, 3 February: 61.3 µg/m³, 2.1× usualNong Bua Lamphu, 4 February: 30.3 µg/m³, 1.0× usualNong Bua Lamphu, 5 February: no readingNong Bua Lamphu, 6 February: 36.3 µg/m³, 1.2× usual29 Jan30311 Feb23456
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, Thailand3 75.11 February23.73.2×
Sakon NakhonSakon Nakhon, Thailand3 48.82 February20.12.4×
YasothonYasothon, Thailand3 70.62 February29.42.4×
Buri RamBuriram, Thailand2 64.03 February26.82.4×
TratTrat, Thailand1 77.02 February34.02.3×
Nong Bua LamphuNong Bua Lamphu, Thailand1 61.33 February29.62.1×
MukdahanMukdahan, Thailand1 56.22 February27.72.0×
PhetchaburiPhetchaburi, Thailand1 80.11 February39.62.0×
Ban Talat BuengChon Buri, Thailand1 66.41 February33.22.0×

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 5 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, North-eastern Thailand, February 2025: 9 cities with PM2.5 at twice their usual or more, 1 to 3 February 2025, smogrank.com/episodes/2025-02-north-eastern-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.