Chiang Mai Ranked Most Polluted City in the World
CHIANG MAI, March 9 (TNA) – Chiang Mai was at one point the world’s worst polluted city Thursday with a USAQI of 174, according to a live ranking by IQAir.com
Levels of PM2.5 particulate matter in the air, shown on the website reached 100.7 microgrammes per cubic metre by 2 pm.
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TNA
