Over 99 per cent of India’s population is breathing polluted air, shows a Greenpeace India’s report issued on Friday. Titled ‘Different Air Under One Sky’, the report’s key findings show that the greatest proportion of people living in India are exposed to PM2.5 concentrations more than five times the WHO annual average guideline.

According to the WHO, the upper limit of annual PM2.5 is five microgram per cubic metre. The region with the highest exposure to pollution in the country is Delhi-NCR, followed by Bihar, Uttar Pradesh, Haryana, West Bengal, etc. Uttarakhand has least exposure to pollution.