Discussed: 20 Jan 2025 at 10: 01
Bangkok and 64 of the 76 regions were covered in hazardous PM2.5 dirt on Monday night, with 28 provinces reporting red rates and the worst air pollutants in Samut Sakhon.
The Geo-Informatics and Space Technology Development Agency ( Gistda ) reported at 9am that particulate matter 2.5 micrometres and less in diameter ( PM2.5 ) reached red ( hazardous-to-health ) levels in 28 provinces, ranging from 75.3 to 133.1 microgrammes per cubic metre of air over the past 24 hours.
The government-set secure level is 37.5µg/m³.
Samut Sakhon state faced the highest PM2.5 levels at 133.1µg/m³, followed by 115.3 in Nakhon Pathom, 107.6 in Sing Buri, 98.7 in Ang Thong, 98.1 in Nonthaburi, 97.3 in Chai Nat, 93.8 in Pathum Thani and 93.4 in Ayutthaya.
Red levels were likewise detected, in descending attempt, in Lop Buri, Ratchaburi, Samut Songkhram, Bangkok, Suphan Buri, Saraburi, Phetchaburi, Loei, Phetchabun, Uthai Thani, Rayong, Samut Prakan, Phichit, Kanchanaburi, Nong Bua Lam Phu, Nakhon Sawan, Chaiyaphum, Khon Kaen, Kamphaeng Phet and Maha Sarakham.
Thirteen counties had acceptable PM2.5 levels. In descending order, yellow ( moderate air quality ) levels were in Ranong, Lampang, Phayao, Phangnga, Surat Thani, Phatthalung, Chiang Rai, Chumphon and Chiang Mai.
Green ( good air quality ) levels were in Nakhon Si Thammarat ( 25µg/m³ ), Mae Hong Son ( 22.3 ), Krabi ( 21.6 ) and Trang ( 18.3 ).
Another 36 provinces had yellow levels, which indicated that ultrafine dust could start to have an impact on health.