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Download Indian capital Delhi has the most polluted air in the world, according to a World Health Organization report released on Wednesday that covers 1,600 cities and 91 countries. Indian media quoted figures from the report showing that Delhi has the highest concentration of PM2.5 particles - those with a diameter of less than 2.5 microns, which can penetrate human lungs, seriously damaging health. Air in the capital has a PM2.5 concentration of 153 micrograms per cubic meter (g/m), far above the WHO standard of just 10g/m, according to the Times of India. The fine particulate pollution is significantly higher in Delhi than many other crowded Asian cities, including Beijing, which is given a PM2.5 level of 56g/m by the WHO report, while Shanghai is listed with concentration of 36g/m. Karachi in Pakistan, meanwhile, is listed much higher, at 117g/m. The concentration of PM10 - coarse particles - in Delhi is about 286g/m, more than 14 times higher than the WHO annual mean standard of 20g/m. Two other cities in Pakistan fare far worse on PM10: Peshawar at 540g/m and Rawalpindi at 448g/m. Indian cities with a very high PM10 level include Gwalior, Raipur and Luck now. This is not the first time Delhi has earned the dubious distinction of having extremely polluted air. In January, Yale University's Environmental Performance Index 2017 ranked India among the bottom five in a list of 178 countries based on various criteria, including air pollution, according to the newspaper. | 
