‘Chiang Mai’ is the second most polluted city in the world.

Chiang Mai, Today, people in many provinces in the upper northern region The effects of the toxic smog and dust can be felt intensified. In some places, the level of PM 2.5 toxic dust exceeded 500 micrograms per cubic meter. including Chiang Mai Rises to number 2 in the world's most polluted cities The main cause is cross-border smog from neighboring countries that was blown in by wind to cover many provinces. During the Royal Rainmaking operation, they tried to fly into a hole in the atmosphere to release dust. Source: Thai News Agency