'43% PM 2.5 pollutants in Delhi originate outside NCR'
Around 43% of the pollution caused by the fine particulate matter (PM 2.5) in Delhi NCR originates from outside the region, a joint study by TERI and the University of California has claimed. The study found that in-house sources in Delhi contribute about 32% of the air pollution, while NCR sources (other than Delhi) contribute an additional 25%.