It is that time of the year in when winter smog sets in and air pollution spikes in Delhi. Delayed withdrawal of rains and consequent deferment of stubble burning this year had made October one of the cleanest in the last few years. But the onset of winter conditions – cool and calm wind, temperature inversion, rapidly increasing farm fires and overall trapping of regional pollution – has created conditions that may trigger the season’s first smog episode soon. The SAFAR (System of Air Quality and Weather Forecasting And Research) programme of Indian Institute of Tropical Meteorology had already predicted…
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