A Chiang Mai resident won a lawsuit against the state for ignoring the air pollution problem. Chiang Mai Administrative Court delivered judgement to the National Environment Board to declare the area as a pollution control zone within 30 days. On the 8th April, 2021, Chiang Mai Administrative Court delivered judgement in Black Case No. Sor.1/2564 and Red Case No. Sor.1/2564, over the claim of