Only seven countries met World Health Organization (WHO) 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.
Only Australia, New Zealand, the Bahamas, Barbados, Grenada, Estonia and Iceland made the grade, IQAir said.