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Is the air you breathe really clean?

Are you breathing clean air?
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Are you breathing clean air?

Is Delhi truly the epicentre of India’s air quality crisis? Is the air in other cities in the central-north region just as bad? Are there southern cities with equally bad air quality? Let's see what the data says.

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Indian cities among most polluted
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Indian cities among most polluted

WHO found that 13 of the 20 cities with the worst air quality in 2018 were in India (after averaging annual PM 2.5 absolute concentration across cities)

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Bad air report from Delhi stations
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Bad air report from Delhi stations

Between November 5, 2018, and November 5, 2019, 9 of 10 pollution watch stations that recorded the worst air quality were in Delhi. The first station outside the central-north belt to show up on the list was in Kolkata, at 48th spot, and the first southern station was in Chennai, at 73rd place.

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It’s all seasonal in Delhi
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It’s all seasonal in Delhi

The seasonality of Delhi’s bad air is significant. Wazirpur, which had the worst annualised air quality over November 2018-2019, had a clean air window from July to September.

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South breathes easy
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South breathes easy

Does the air quality index in other cities ever reach Delhi-like levels? In winter, Kolkata comes close. Chennai, Mumbai and Hyderabad are largely in the safe zone throughout the year.

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Most cities face bad air
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Most cities face bad air

Most cities score poorly on the air quality index (AQI). The only difference is that the number of hazardous days are lower when Wazirpur, Delhi compared with Delhi.

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Copyright © 2019 Bennett, Coleman & Co. Ltd. All rights reserved. For reprint rights: Times Syndication Service