Chiang Mai air world's worst

A rescue worker sprays water in the air in a bid to relieve smog in Chiang Mai province early this month. (Photo: Panumet Tanraksa)
A rescue worker sprays water in the air in a bid to relieve smog in Chiang Mai province early this month. (Photo: Panumet Tanraksa)

Chiang Mai had the world's worst air pollution with 180 microgrammes of PM2.5 per cubic metre of air over the 24 hours ending at 4am on Sunday, according to a leading pollution website.

The website ranked the northern province the most polluted on earth based on the amount of fine dust measured over the 24-hour period. Trailing in Chiang Mai's dust were Mumbai with 179µg/m³, Lahore 160µg/m³, Hanoi 156µg/m³ and Delhi 154µg/m³.

People in Chiang Mai have been unable to see Doi Suthep mountain for weeks due to the toxic smog.

The Meteorological Department predicted storms and wind in the North from Sunday to Tuesday that may ease the pollution.

The Geo-Informatics and Space Technology Development Agency (Gistda) reported 1,061 hotspots in Thailand on Saturday while there were 4,363 hotspots in Myanmar, 2,868 in Laos, 1,182 in Cambodia, 647 in Vietnam and 32 in Malaysia.

In Thailand, 661 hotspots were found in forests and a further 192 hotspots on farmland. The northern province of Mae Hong Son had the most hotspots in the country – 127 – on Saturday.

PM2.5 was measured at 53.1 µg/m³ on average in Bangkok over the 24 hours to 4am.


  • average: an amount calculated by adding several amounts together, finding a total, and dividing the total by the number of amounts - เฉลี่ย, ค่าเฉลี่ย
  • dust: very small pieces of dirt that cover surfaces inside buildings like a powder - ฝุ่น
  • ease: to make or become less severe, difficult, unpleasant, painful, etc - ทำให้ง่าย
  • forest: an area with trees, animals and plants - ป่า
  • hotspot: a place where there is a lot of activity, or a higher temperature than normal -
  • polluted: (of water, air, land) having dirty or harmful substances so that it is no longer pleasant or safe to use - ซึ่งเป็นมลพิษ
  • predict: to say that an event or action will happen in the future, especially as a result of knowledge or experience - คาดการณ์ว่า พยากรณ์จากสถิติว่า
  • rank: to put someone or something into a position according to their success, importance, size etc - จัดลำดับ
  • smog (noun): clouds of dirty and smokey air - หมอกควัน, ควัน, ควันพิษ,
  • storm: bad weather with strong winds - พายุ
  • toxic: poisonous and harmful to people, animals or the environment - เป็นพิษ
  • μg/m³: microgrammes per cubic metre, a measure used for air pollution -
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