City turns gasp chamber on season’s worst air day

As Delhi-NCR’s 24-hour PM10 and PM2.5 concentrations have been over 500 and 300 micrograms per cubic metre for over 17 and 19 hours, respectively, states have been told to be prepared to implement “emergency” measures under the Graded Response Action Plan (GRAP), including a ban on constructions, odd-even traffic scheme and closure of schools. Officials said no major change in AQI is expected for four-five days.

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