Twenty-two of the world’s 30 worst cities for air pollution are in India, according to a new report, with Delhi again ranked the world’s most polluted capital.
The Greenpeace and AirVisual analysis of air pollution readings from 3,000 cities around the world found that 64% exceed the World Health Organization’s annual exposure guideline for PM2.5 fine particulate matter – tiny airborne particles, about a 40th of the width of a human hair, that are linked to a wide range of health problems.
Every single measured city in the Middle East and Africa exceeds the WHO guidelines, as well as 99% of cities in south Asia and 89% in east Asia. Since many cities, particularly in Africa, do not have up-to-date public air quality information, the actual number of cities exceeding PM2.5 thresholds is expected to be much higher, the report authors said.
The report is based on 2018 air quality data from public monitoring sources, such as government monitoring networks, supplemented with validated data from outdoor IQAir AirVisual monitors operated by private individuals and organisations.
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