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Delhi surpasses Lahore as world’s most polluted major city

India’s capital, Delhi, has overtaken Lahore to become the world’s most polluted major city, as hazardous air quality and thick smog reduced visibility across the city of nearly 20 million people on Friday. According to Swiss air quality monitoring organisation IQAir, Delhi recorded an Air Quality Index (AQI) of 334, placing it at the top of the global pollution rankings. India’s Central Pollution Control Board (CPCB), however, reported an even higher reading of 403…