- New Delhi has been ranked the world's most polluted capital for the fourth consecutive year since 2018.
- According to the Air Quality Report 2023, Delhi's PM2.5 levels increased from 89.1 micrograms per cubic meter in 2022 to 92.7 micrograms per cubic meter in 2023.
- Begusarai, in Bihar, is now the most polluted metropolitan area in the world.
- Its average PM2.5 concentration was 118.9 micrograms per cubic metre. It did not find a place in the ranking for 2022.
- India's air quality was the third worst in the world after Bangladesh and Pakistan.
- India's average annual PM2.5 concentration was 54.4 micrograms per cubic metre.
- According to the report, for more than a billion people, PM2.5 concentrations in India exceed the World Health Organization's annual guideline limit of 5 micrograms per cubic metre.
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