The Commission for Air Quality Management (CAQM) on Tuesday (December 24) revoked stage 4 of the Graded Response Action Plan (GRAP) across Delhi-NCR amid a dip in pollution levels. Notably, the stage 4 curbs under the GRAP include a ban on all construction activities, entry of non-essential polluting trucks into Delhi, and mandatory shifting of school classes, except for classes 10 and 12, to hybrid mode.