Only seven countries met WHO air quality standards in 2024, data shows
2 weeks, 3 days ago

Only seven countries met WHO air quality standards in 2024, data shows

The Hindu  

Only seven countries met World Health Organization air quality standards last year, data showed on Tuesday, as researchers warned that the war on smog would only get harder after the United States shut down its global monitoring efforts. Chad and Bangladesh were the world's most polluted countries in 2024, with average smog levels more than 15 times higher than WHO guidelines, according to figures compiled by Swiss air quality monitoring firm IQAir. Significant data gaps, especially in Asia and Africa, cloud the worldwide picture, and many developing countries have relied on air quality sensors mounted on U.S. embassy and consulate buildings to track their smog levels. India, fifth in the smog rankings behind Chad, Bangladesh, Pakistan and the Democratic Republic of Congo, saw average PM2.5 fall 7% on the year to 50.6 mg/cu m. But it accounted for 12 of the top 20 most polluted cities, with Byrnihat, in a heavily industrialised part of the country's northeast, in first place, registering an average PM2.5 level of 128 mg/cu m. Climate change is playing an increasing role in driving up pollution, Chester-Schroeder warned, with higher temperatures causing fiercer and lengthier forest fires that swept through parts of South East Asia and South America.

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