New Delhi, Nov. 23 -- The Commission for Air Quality Management (CAQM) in Delhi-NCR has further tightened its curbs under the Graded Response Action Plan (Grap) to limit air pollution, continuing an exercise that started last Wednesday, when it started moving to stricter curbs under the initial stages. As part of this, the recommendation for states to impose 50% work-from-home for all government and private offices has been moved from Stage 4 of Grap to Stage 3, according to a November 21 notification. In keeping with the recommendation, the Delhi government on Saturday issued an advisory asking private offices to operate with 50% on-site staff and allow the remaining staff to work from home. Environment minister Manjinder Singh Sirsa said the government is implementing all pollution-control measures and monitoring round-the-clock....