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Employers in the smoggy North and other areas are being advised to allow their employees to work from home whenever possible because of the high levels of PM2.5 dust in the air.
The Thai Sang Thai Party on Sunday vowed to solve the PM2.5 air pollution in Bangkok within three years if it becomes part of the next coalition government.
Chiang Mai had the world's worst air pollution with 180 microgrammes of particulate matter 2.5 micrometres and less in diameter (PM2.5) per cubic metre of air over the 24 hours ending at 4am on Sunday, according to a leading pollution website.
Work-from-home measures will be implemented in Bangkok if the hazardous pollution levels caused by ultra-fine particles do not improve soon, said Interior Minister Anupong Paojinda on Saturday.
Nakhon Phanom is cracking down on locals burning garbage and vegetation outdoors as the Northeast city on the banks of the Mekong chokes under heavy smog that descended on Tuesday.