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IQAir’s 2021 World Air Quality Report: Delhi world’s most polluted capital

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New Delhi has been ranked the world’s most polluted capital city for the second consecutive year as per IQAir’s 2021 World Air Quality Report. New Delhi is followed by Dhaka (Bangladesh), N’Djamena (Chad), Dushanbe (Tajikistan) and Muscat (Oman) as the top five most polluted capital cities respectively. Meanwhile, Bhiwadi was the most polluted city in India, followed by Ghaziabad, Delhi and Jaunpur.

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Bangladesh was the most polluted country, followed by Chad, Pakistan and Tajikistan. India was the fifth most polluted country.

Key points of the report:

  • The 2021 World Air Quality Report by Swiss organisation IQAir is the first major global air quality report based on updated annual WHO air quality guidelines for PM2.5.
  • The new guidelines were released in September 2021 and cut existing annual PM2.5 guideline values from 10 Aug/m 3 to 5 Aug/m 3.
  • The report has analysed PM2.5 air pollution measurements in 6,475 cities in 117 countries, regions and territories.
  • Of the 15 most polluted cities in Central and South Asia in 2021, 12 were in India.
  • PM2.5 concentration in New Delhi increased by 14.6 per cent in 2021 to 96.4 Ig/m3, compared to 84 Ig/m3 in 2020.

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