In 2021, pollution continued to achieve unhealthy levels in line with a report on World Air Quality which was prepared by ”IQAir” a swiss organization. Also, for the fourth year running, capital of India remained to be the foremost polluted capital city within the world.

35 Indian cities are listed by the index under the worst air quality tag for 2021.
Bhiwadi, Rajasthan topped this list and was followed Ghaziabad, province.
From state, 14 other cities have also been included during this list and that they are Ghaziabad, Lucknow, Meerut, Kanpur, Amroha, Agra, Varanasi, Jaunpur, Greater Noida, and Noida. These cities exceeded the PM2.5 limit of 0-5 µg/m³ by quite 10 to fifteen times.
According to this report, not one country from round the globe managed to satisfy the air quality standard of WHO in 2021.

In some regions smog rebounded after a dip thanks to Covid.
WHO’s September 2021 guidelines state that acceptable air quality with PM2.5 concentration levels should range between 0-5 g/m3. But, all the cities during this report have PM2.5 levels that are a minimum of 10 times above the approved limits.

This report has been supported the information of PM2.5 air quality taken from 6,475 cities in 117 regions, countries, and territories from across the world. the info that was accustomed create this newly released report was generated from thousands of low-cost and regulatory air quality monitoring stations that are operated by non-profit organizations, governments, educational facilities, research institutions, citizen scientists, and firms from everywhere the globe.

The report states that pollution is taken into account to be the largest environmental health threat across the globe. Per year, pollution accounts for seven million deaths on this planet. because of pollution plenty of diseases, like cancer, asthma, heart diseases, etc. are aggravated.