India's air pollution worsened in 2021, according to the World Air Quality Report released by IQAir, a Swiss firm. This ends a three-year trend of improving air quality. The average air pollution, measured in the lethal and microscopic PM2.5 pollutant, is 58.1 micrograms per cubic meter, which is more than 10 times the World Health Organisation's (WHO) air quality guidelines. No city in India met the WHO standard.
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