Changes in air pollution in India 2019-2023, by select city
India's capital Delhi observed a 5.9 percent reduction in average annual PM2.5 levels between 2019 and 2023. In 2023, Delhi was the world's most polluted capital city. Meanwhile, Kanpur recorded overall reductions of 50 percent during the same five-year period. In comparison, Mumbai's PM2.5 levels in 2023 were almost 40 percent higher than they were in 2019.