India, Dec. 14 -- The air quality commission in the Capital on Saturday, for the first time, invoked Stage IV of the Graded Response Action Plan (GRAP) restrictions. On Saturday, the overall Air Quality Index in Delhi hit close to the 450 mark, plunging large parts of the city into thick smog and triggering emergency curbs.

With the Commission for Air Quality Management's (CAQM) announcement, the Delhi Government has issued directions to all Government offices under it and all private offices in the National Capital Territory (NCT) of Delhi, to work on 50 per cent strength and the rest to work from home.

As part of Stage-IV, there is a ban on the entry of trucks - except LNG, CNG, electric and BS-IV diesel - into Delhi, except those car...