On Friday, Delhi's air quality dropped to "severe plus", termed "emergency" levels. Schools were shut. A public health emergency was declared. It is official: the city's air has become a toxic cocktail and the general advisory is to avoid "undue and prolonged exposure" and "minimize unnecessary travel", forget about playing a game of international cricket.

from Times of India https://timesofindia.indiatimes.com/sports/cricket/bangladesh-in-india/india-vs-bangladesh-1st-t20i-why-is-it-business-as-usual-for-international-cricket/articleshow/71861410.cms