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About 200 residents of Mae Sai in Chiang Rai gathered at the district office on Monday to demand urgent action to tackle soaring air pollution.
As the economy fires up, emissions are on the rise but the country is on track to deliver ambitious air quality improvements by 2025.
The government is seeking cooperation with neighbouring countries in the Association of Southeast Asian Nations (Asean) to combat the transboundary haze pollution choking the region.
Hazardous levels of PM2.5 dust were again recorded in the North and upper Northeast on Monday morning, peaking at 550 microgrammes per cubic metre of air over 24 hours in Chiang Rai's Mae Sai district.
Hazardous levels of the ultra-fine PM2.5 dust were once again reported across the North and upper Northeast on Monday.