Chiang Mai retained its spot as the world’s most polluted city on the IQAir global index, which does not feature Chiang Rai. - The Nation
CHIANG RAI (The Nation/Asia News Network): Chiang Rai residents protested at the district office on Monday (March 27), and demanded that the authorities take urgent action to tackle air pollution.
Northern Thailand once again topped the world pollution rankings on Monday, with Chiang Mai registering a high of 287 micrograms of PM2.5 dust per cubic m, but Chiang Rai hitting 542 mcg per cubic m.
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