New Delhi, Nov. 4 -- India needs to have a regional emission inventory of air pollution sources for quick response once the air quality starts to deteriorate, according to experts who pointed out that such a database would help developing localised graded response action plans (GRAP) that would be much more effective than one for an area as large as the National Capital Region (NCR).

As of now, the Union ministry of earth sciences releases air pollution emission inventory for states and regions based on the inputs such as the number of industries, cases of farm fires, and vehicles registration, received from the various state pollution control boards.

According to the ministry's inventory report for 2018, road dust was the biggest source ...