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In page Environmental issues in Thailand:
"Industrial growth has created high levels of air pollution in Thailand. Vehicles and factories contribute to air pollution, particularly in Bangkok, which experienced high levels of air pollution in the winter of 2019.[3] Recent research (2019) points to agricultural burning as the root cause of PM 2.5 pollution in Thailand.[citation needed] PM 2.5 is a measurement of particulates in the atmosphere smaller than 2.5 microns.
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