"PM2.5"

The city of Phayao has erected Thailand’s third “Fahsai” (Clear Sky) air purification tower to combat seasonal smog conditions that are among the worst in the North.

Air quality in Bangkok, Samut Prakan, Chiang Rai, Mae Hong Son and Chiang Mai provinces hit unsafe levels on Tuesday morning, the Centre for Air Pollution Mitigation reported.

Chiang Mai once again became the world's most polluted city on Friday due to a forest fire in Doi Suthep-Pui National Park on Thursday night.

Particulate matter smaller than 2.5 micrometres in diameter (PM2.5)– exceeded the safe level in 20 provinces, the Air Quality and Noise Management Bureau detected on Saturday at 7am

Air pollution in Bangkok, Samut Prakan, Samut Sakhon, Chiang Rai and Mae Hong Son hit unsafe levels on Wednesday morning, the Centre for Air Pollution Mitigation reported.

Air pollution in Bangkok, Samut Prakan, Samut Sakhon, Chiang Rai, Mae Hong Son and Tak provinces hit unsafe levels on Tuesday morning, the Centre for Air Pollution Mitigation reported.

The high number of vehicles on Thai roads have been blamed for the increasing PM2.5 dust pollution affecting both urban and non-urban people.

The air quality in Bangkok and 31 provinces hit unsafe levels on Friday morning, according to the Centre for Air Pollution Mitigation.

Air pollution due to a forest fire led to an increase in the number of respiratory patients in Chiang Mai on Wednesday.

Chiang Mai was ranked as having the worst air quality in the world for three consecutive days on Tuesday morning.

Chiang Mai was the world's most polluted city on Sunday, according to an IQAir report.

Air quality in Bangkok and its vicinity improved on Tuesday morning, with PM2.5 (particles less than 2.5 micrometres in diameter) readings coming in between 14 and 36 micrograms per cubic metre (μg/m3) of air, the Bangkok Air Pollution Coordination Centre reported.