One of the top 20 most polluted cities in the world is Delhi. Brynhat was the most polluted city in the world. Followed by Delhi, according to the 2024 World Air Quality Report.

Byrnihat, Delhi, Mullanpur (Punjab), Faridabad, Loni, New Delhi, Gurugram, Ganganagar, Greater Noida, Bhiwadi, Muzaffarnagar, Hanumangarh, and Noida are among the 13 Indian cities on the list.

The Democratic Republic of the Congo, Bangladesh, Pakistan, and Chad are the other four nations on the list. The study examines PM2.5 air quality data from 8,954 cities in 138 nations and was published by the Swiss air quality technology company IQAir. It is based on data from more than 40,000 air quality monitoring stations and inexpensive sensors run by scientists, government agencies, academic institutions, and nonprofit groups.

India In the list on?
With an average Air Quality Index (AQI) of 50.6 μg/m3, which is ten times higher than the World Health Organization’s (WHO) annual PM2.5 guideline value of 5 μg/m3, India is the fifth most polluted nation in the world. It was the third most polluted nation in 2023.

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With an average annual PM2.5 concentration of 128.2 μg/m3, Byrnihat, located on the border of Assam and Meghalaya, was the most polluted metropolitan region in 2024. Emissions from nearby factories, such as distilleries and iron and steel plants, are a major cause of the pollution. The study states that PM2.5 concentrations in India decreased by 7% in 2024, averaging 50.6 micrograms per cubic meter, as opposed to 54.4 micrograms per cubic meter in 2023.

Air Quality in other countries
Only 12 countries, regions, and territories recorded PM2.5 concentrations below the WHO annual PM2.5 guideline of 5.0 µg/m³, most of which were in the Latin America and Caribbean or Oceania region. However, in 2024, 17 percent of cities included in the report met the WHO annual PM2.5 guideline level, up from 9 percent in 2023, according to the report.

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