IQAir Air Visual 2018 World Air Quality Report by Greenpeace South East Asia
has ranked Delhi as the world’s most polluted capital. In 2018, Delhi had an
average yearly PM2.5 concentration at 113.5 micrograms per cubic metre.
(Bangladesh) was ranked the second-most polluted capital at 97.1 micrograms per
cubic metre followed by Kabul (Afghanistan) with 61.8 micrograms per cubic
the city-wise rankings differ. In city-wise ranking, Gurugram ranked first with
an annual average PM2.5 reading of 135.8 micrograms per cubic meter
followed by Ghaziabad, followed by Faridabad, Faisalabad (Pakistan), Bhiwadi
and Noida. Delhi ranked 11th.
to the National Ambient Air Quality Standards, the annual permissible limit for
PM2.5 is 40ug/m3. The annual permissible limits prescribed by the World Health
Organization are even lower at 10ug/m3. National Ambient Air Quality Standards
are the standards for ambient air quality set by the Central Pollution Control
Board (CPCB). Ambient air quality refers to the condition/ quality of outdoor