The deteri­or­a­tion in Delhi’s air qual­ity, which was skirt­ing the “very poor” cat­egory on Sunday, was caused more by external factors than from sources within the cap­ital, accord­ing to the Centre’s Decision Sup­port Sys­tem (DSS). Data on Sunday showed at least 67.89% of Delhi’s total PM2.5 con­tri­bu­tion was from external sources.

The deterioration in Delhi’s air quality, which was skirting the ‘very poor’ category on Sunday, was caused more by external factors than by sources within the capital, according to the Centre’s Decision Support System (DSS).
Data on Sunday showed that at least 67.89% of Delhi’s total PM2.5 contribution was from external sources.
For the sources within Delhi, the transport sector in Delhi accounted for 16.43% of the pollution in the city, followed by Delhi’s residential sector (4.27%) and then the industries sector (3.63%).