Delhi -- bracing for a spike in coronavirus cases as pollution levels rise and winter approaches -- went without the traditional burning of Ravan effigies on Dusshera today, to keep the air clean. But by early evening, the city was enveloped by a thick haze and the air quality index showed "very poor" category in busy areas. A report by National Centre for Disease Control on October 8 said Delhi may see up to 15,000 Covid cases daily in winter. Over the last two days, the daily spike has been more than 4,000 -- the needle going up again after Chief Minister Arvind Kejriwal said the city was past the peak of the disease.