SmogRank / Episodes / Thailand

North-eastern Thailand, February 2024

For 1 day, on 7 February 2024, 9 cities in Thailand had PM2.5 at least twice their usual for the time of year. The worst reading was Chaiyaphum, Chaiyaphum, Thailand: 77.5 µg/m³ on 7 February, about 2.9× its usual 27.0.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached9in 1 country
Days17 February 2024
Worst day7 February9 cities counted
Furthest above usual2.9×Chaiyaphum

Day by day

7 February 9 cities at twice their usual or more
Nakhon RatchasimaKhon KaenBuri RamPhetchabunSurinSaraburiNakhon NayokLop BuriSi Maha PhotUdon ThaniSing BuriAranyaprathetLoeiPhichitPhra Nakhon Si AyutthayaNakhon SawanChai NatSi Sa KetKhlong LuangNong ChokKhlong Sam WaSai MaiKhan Na YaoLat KrabangLak SiSuphan BuriBueng KumSaphan SungBang KapiBan Khlong PrawetMueang NonthaburiBang Bo DistrictBang NaBangkokPhra PradaengSamut PrakanBang Khun ThianNong KhaemBan Samae DamSukhothaiNakhon PathomSamut SakhonKamphaeng PhetUttaraditRatchaburiMae SotAmnat CharoenKalasinYasothonKanchanaburiNong Bua LamphuUbon RatchathaniMukdahanSakon NakhonChaiyaphum
4 Feb5678910
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

Ubon RatchathaniUbon Ratchathani, 4 February: 81.1 µg/m³, 2.6× usualUbon Ratchathani, 5 February: 72.3 µg/m³, 2.3× usualUbon Ratchathani, 6 February: 63.6 µg/m³, 2.1× usualUbon Ratchathani, 7 February: 72.4 µg/m³, 2.4× usualUbon Ratchathani, 8 February: no readingUbon Ratchathani, 9 February: 62.8 µg/m³, 2.0× usualUbon Ratchathani, 10 February: 25.3 µg/m³, 0.8× usualMukdahanMukdahan, 4 February: 69.1 µg/m³, 2.5× usualMukdahan, 5 February: 67.6 µg/m³, 2.5× usualMukdahan, 6 February: 66.6 µg/m³, 2.4× usualMukdahan, 7 February: 73.1 µg/m³, 2.7× usualMukdahan, 8 February: no readingMukdahan, 9 February: 45.0 µg/m³, 1.6× usualMukdahan, 10 February: 24.2 µg/m³, 0.9× usualAmnat CharoenAmnat Charoen, 4 February: 53.0 µg/m³, 2.1× usualAmnat Charoen, 5 February: 57.0 µg/m³, 2.2× usualAmnat Charoen, 6 February: 50.3 µg/m³, 1.9× usualAmnat Charoen, 7 February: 54.9 µg/m³, 2.1× usualAmnat Charoen, 8 February: no readingAmnat Charoen, 9 February: 43.1 µg/m³, 1.7× usualAmnat Charoen, 10 February: 13.8 µg/m³, 0.5× usualSakon NakhonSakon Nakhon, 4 February: 40.5 µg/m³, 2.3× usualSakon Nakhon, 5 February: 37.6 µg/m³, 2.1× usualSakon Nakhon, 6 February: 40.8 µg/m³, 2.3× usualSakon Nakhon, 7 February: 50.0 µg/m³, 2.8× usualSakon Nakhon, 8 February: no readingSakon Nakhon, 9 February: 21.3 µg/m³, 1.2× usualSakon Nakhon, 10 February: 9.8 µg/m³, 0.6× usualKanchanaburiKanchanaburi, 4 February: no readingKanchanaburi, 5 February: 48.5 µg/m³, 1.4× usualKanchanaburi, 6 February: 70.5 µg/m³, 2.0× usualKanchanaburi, 7 February: 74.9 µg/m³, 2.2× usualKanchanaburi, 8 February: no readingKanchanaburi, 9 February: 49.3 µg/m³, 1.4× usualKanchanaburi, 10 February: 41.7 µg/m³, 1.2× usualChaiyaphumChaiyaphum, 4 February: 43.9 µg/m³, 1.6× usualChaiyaphum, 5 February: 44.8 µg/m³, 1.7× usualChaiyaphum, 6 February: 54.1 µg/m³, 2.0× usualChaiyaphum, 7 February: 77.5 µg/m³, 2.9× usualChaiyaphum, 8 February: no readingChaiyaphum, 9 February: 74.0 µg/m³, 2.7× usualChaiyaphum, 10 February: 44.5 µg/m³, 1.6× usualKalasinKalasin, 4 February: 56.5 µg/m³, 1.8× usualKalasin, 5 February: 63.2 µg/m³, 2.0× usualKalasin, 6 February: 62.6 µg/m³, 2.0× usualKalasin, 7 February: 66.8 µg/m³, 2.1× usualKalasin, 8 February: no readingKalasin, 9 February: 66.1 µg/m³, 2.1× usualKalasin, 10 February: 29.9 µg/m³, 0.9× usualNong Bua LamphuNong Bua Lamphu, 4 February: 40.6 µg/m³, 1.5× usualNong Bua Lamphu, 5 February: 30.0 µg/m³, 1.1× usualNong Bua Lamphu, 6 February: 43.1 µg/m³, 1.6× usualNong Bua Lamphu, 7 February: 60.6 µg/m³, 2.3× usualNong Bua Lamphu, 8 February: no readingNong Bua Lamphu, 9 February: 71.2 µg/m³, 2.6× usualNong Bua Lamphu, 10 February: 35.1 µg/m³, 1.3× usualYasothonYasothon, 4 February: 55.2 µg/m³, 1.9× usualYasothon, 5 February: 55.8 µg/m³, 1.9× usualYasothon, 6 February: 54.6 µg/m³, 1.9× usualYasothon, 7 February: 59.6 µg/m³, 2.1× usualYasothon, 8 February: no readingYasothon, 9 February: 59.3 µg/m³, 2.1× usualYasothon, 10 February: 21.8 µg/m³, 0.8× usual4 Feb5678910
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
ChaiyaphumChaiyaphum, Thailand1 77.57 February27.02.9×
Sakon NakhonSakon Nakhon, Thailand1 50.07 February17.62.8×
MukdahanMukdahan, Thailand1 73.17 February27.52.7×
Nong Bua LamphuNong Bua Lamphu, Thailand1 71.29 February26.92.6×
Ubon RatchathaniUbon Ratchathani, Thailand1 81.14 February30.82.6×
Amnat CharoenAmnat Charoen, Thailand1 57.05 February25.82.2×
KanchanaburiKanchanaburi, Thailand1 74.97 February34.82.2×
KalasinKalasin, Thailand1 66.87 February31.92.1×
YasothonYasothon, Thailand1 59.67 February28.82.1×

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 18 of 24 episodes in Thailand since our records began, by cities reached.

Bars: cities reached; colour: the level of the episode's highest daily reading. All 24.

Use this page

SmogRank, North-eastern Thailand, February 2024: 9 cities with PM2.5 at twice their usual or more, 7 February 2024, smogrank.com/episodes/2024-02-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.