Page 2 of Nifty 50

Mumbai’s hot, sunny, low-wind weather is trapping emissions and fostering ground-level ozone, worsening pollution from traffic, construction and waste burning. IQAir ranked Mumbai fifth among the world’s most polluted cities, reporting a US-scale AQI of 152, while India’s CPCB recorded 98; differing scales, times and locations make the readings incomparable.