blurred of PM 2.5 smoke that builds up over Chiang Mai during dry season and PM 2.5 dust is still health concern for Chiang Mai people because PM 2.5 dust levels exceed health safety standards. photo

blurred of PM 2.5 smoke that builds up over Chiang Mai during dry season and PM 2.5 dust is still health concern for Chiang Mai people because PM 2.5 dust levels exceed health safety standards. Pro Photo

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