According to an analysis of air quality in several cities around the world, fifteen of the top 20 most polluted cities in the world are located in India.
In 2018, Gurugram, in Haryana, was the topmost city in the list with an average annual particulate matter (PM 2.5) quality of 135 g/m3 (micrograms/cubic metre).Delhi is a frequent match on global pollution hotspots was only the 11th most noxious city behind Lahore, Pakistan (10th) and Hotan, China (8th).
The other cities in India that made their position in list of 20 were Ghaziabad, Faridabad, Bhiwadi, Noida, Patna, Lucknow, Jodhpur, Muzaffarpur, Varanasi, Moradabad, Agra, Gaya and Jind.
Of the cities analyzed, 64% exceeded the WHO’s annual exposure guideline (10g/m3) for fine particulate matter, also known as PM2.5. India’s annual guidelines range from 40-60 g/m3, depending on whether they are residential or industrial areas.
The ranking is a one of its kind study that relies on ground-based sensors located in 3,000 cities from 73 countries was compiled by IQAir Group, a manufacturer of air-monitoring sensors as well as purifiers and environmentalist group Greenpeace.