• Fifteen of the top 20 most polluted cities in the world are located in India, according to an analysis of air quality in several cities around the world.
  • Gurugram, in Haryana, topped the list with an average annual particulate matter (PM 2.5) quality of 135 g/m3 (micrograms/cubic metre), in 2018. Delhi — a frequent fixture 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 the list of 20 were Ghaziabad, Faridabad, Bhiwadi, Noida, Patna, Lucknow, Jodhpur, Muzaffarpur, Varanasi, Moradabad, Agra, Gaya and Jind.
  • When ranked by country, Bangladesh emerged as the most polluted followed by Pakistan and India respectively.
  • Of the cities analysed, 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.
  • Every single one of measured cities with data in the Middle East and Africa exceeded the WHO guideline, while 99% of cities in South Asia, 95% of cities in Southeast Asia and 89% of cities in East Asia breached this level.
  • The ranking — 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.
  • Jakarta and Hanoi emerged as Southeast Asia’s two most polluted cities and average concentrations in the cities in China fell by 12% from 2017 to 2018.
  • Beijing ranks now as the 122nd most polluted city in the world in 2018 and China, the 12th most polluted country in the world.
  • Of the countries analysed, Iceland emerged as the one with the cleanest air.