Amid a veritable festival surge in the number of COVID-19 infections in the city, Delhi Chief Minister Arvind Kejriwal today pointed at pollution as a reason for the spike and hoped to control its spread in the next 7-10 days. "Even I am worried about the rise in the number of cases...We are taking all necessary measures...I hope in seven to 10 days, the number of cases should decline and the situation should come under control," Mr Kejriwal said in a public message.