Chronic air pollution makes Thailand's Chiang Mai world's most polluted city
Published date: Thu, 11 Mar 2021 16:14:54 +0700Chiang Mai in northern Thailand ranked the most polluted city in the world for four days in a row as the hazardous haze clouded the city harming thousands of locals.
The level of PM2.5 dust particles in the northern city exceeded the safe point, reaching 183 microgrammes per cubic metres by 2pm on March 10. It was the worst in the world in the morning before the smog eased in the afternoon.
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