Forty-four areas of Bangkok, Samut Songkhram, Samut Sakhon and Nakhon Pathom have excessive levels of PM2.5 dust in the atmosphere, measured at 24.1μg-61μg (microns).

Don Mueang, Lak Si and Nong Khaem have the highest levels, measured at 70μg, 69.6μg and 62.3μg respectively, according to the Air4thai website.

Except for southern provinces, where air quality is good, provinces in the north, northeast, east, west and the central region have PM2.5 exceeding the standard threshold of 37.5μg. Higher PM2.5 levels are detected in Ratchaburi (71.4μg), Ang Thong (70.7μg), Chainat (70.4μg), Sing Buri (67.1μg) and Nonthaburi (64μg).

According to the Geo-informatics and Space Technology Development Agency (GISTDA), 217 hotspots were detected in Thailand on Sunday, most in farming areas, followed by land reform areas, forest reserves and communities. Lop Buri, Khon Kaen and Chon Buri had more hotspots than the rest of the country, recorded at 30, 17 and 12 respectively.

GISTDA also detected 812 hotspots in Cambodia, 391 in Myanmar, 99 in Laos and 81 in Vietnam on the same day.