Delhi air pollution: The Centre on Sunday reportedly ordered a ban on construction work related to linear public projects in Delhi-NCR and the entry of polluting trucks and commercial four-wheelers into the capital as an air quality crisis gripped the region, reported the PTI.

These measures constitute the final stage, Stage IV, of the Centre's air pollution control plan, which is activated at least three days before the Air Quality Index surpasses the 450 mark in the capital.