SHANGHAI: Not a single country managed to meet the World Health Organization\u0027s (WHO) air quality standard in 2021, a survey of pollution data in 6,475 cities showed on Tuesday (Mar 22), and smog even rebounded in some regions after a COVID-19 related dip. The WHO recommends that average annual readings of
SHANGHAI: Not a single country managed to meet the World Health Organization's air quality standard in 2021, a survey of pollution data in 6,475 cities showed on Tuesday , and smog even rebounded in some regions after a COVID-19 related dip.
But only 3.4 per cent of the surveyed cities met the standard in 2021, according to data complied by IQAir, a Swiss pollution technology company that monitors air quality. As many as 93 cities saw PM2.5 levels at 10 times the recommended level. India's overall pollution levels worsened in 2021 and New Delhi remained the world's most polluted capital, the data showed. Bangladesh was the most polluted country, also unchanged from the previous year, while Chad ranked second after the African country's data was included for the first time.
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