The tech hub of Gurugram, a city just to the south-west of Delhi which was previously known as Gurgaon, and where international firms including Uber and TripAdvisor have headquarters, ranked the most polluted in the world with an average of more than 135 micrograms of PM2.5 per cubic metre (µg/m3) throughout the year.
Delhi is ranked 11th. Link
St Clements, the worst affected area in Oxford has an average of 61 micrograms of Nitrogen Dioxide (NO2) per cubic metre of air.
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