Air quality in Thailand has worsened dramatically, with PM2.5 levels surpassing safety thresholds in 42 provinces, including regions from the north, northeast, and central areas. The Air Pollution Resolution Communication Centre reported early on Tuesday, April 15, that these unsafe levels could intensify over the next week.
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In the north, provinces such as Chiang Rai, Chiang Mai, and Nan registered PM2.5 levels ranging from 54.2 to 201.1 microgrammes per cubic metre, which is well above the safety standard. The northeast showed similar readings, with concentrations between 30.6 and 190.1 microgrammes. Central provinces like Nonthaburi and Ayutthaya recorded figures from 30.5 to 91.6 microgrammes.
Bangkok and adjacent areas experienced PM2.5 levels from 25.0 to 42.0 microgrammes across four zones. Meanwhile, the eastern regions maintained moderate air quality, with figures between 17.8 and 33.9 microgrammes. The situation signals a severe increase in pollution across crucial regions.
Affected Provinces:
North: Chiang Rai, Chiang Mai, Nan, Mae Hong Son, Phayao, Lamphun, Lampang, Phrae, Uttaradit, Sukhothai, Phitsanulok, Tak, Kamphaeng Phet, Phichit, Phetchabun.
Northeast: Bueng Kan, Nong Khai, Loei, Udon Thani, Nakhon Phanom, Nong Bua Lamphu, Sakon Nakhon, Mukdahan, Khon Kaen, Kalasin, Amnat Charoen, Chaiyaphum, Ubon Ratchathani, Si Sa Ket.
Central and Western: Nonthaburi, Bangkok, Nakhon Sawan, Uthai Thani, Sing Buri, Lop Buri, Saraburi, Suphan Buri, Ayutthaya, Kanchanaburi, Ratchaburi, Samut Songkhram, Phetchaburi.
Forecasters warn that pollution might worsen, affecting health and daily life. Authorities and environmental agencies must implement strategies to combat the escalating crisis and reduce health risks. Continued monitoring and advisories are anticipated as the situation evolves.
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Adapted by ASEAN Now · The Thaiger · 15 Apr 2026