This article confirms what I had suspected all along, having visited Delhi in winters:
Various recent studies and data suggest that air quality in Delhi is worse than in Beijing, though India’s air pollution problems do not get nearly as much attention on the world stage as those of Beijing. One study shows that Indians have the world’s weakest lungs. The World Health Organization says India has the world’s highest rate of death caused by chronic respiratory diseases, and it has more deaths from asthma than any other nation.
The link in the article above provides the following information:
Lately, a very bad air day in Beijing is about an average one in New Delhi.
The United States Embassy in Beijing sent out warnings in mid-January, when a measure of harmful fine particulate matter known as PM2.5 went above 500, in the upper reaches of the measurement scale, for the first time this year. This refers to particulate matter less than 2.5 micrometers in diameter, which is believed to pose the greatest health risk because it penetrates deeply into lungs.
But for the first three weeks of this year, New Delhi’s average daily peak reading of fine particulate matter from Punjabi Bagh, a monitor whose readings are often below those of other city and independent monitors, was 473, more than twice as high as the average of 227 in Beijing. By the time pollution breached 500 in Beijing for the first time on the night of Jan. 15, Delhi had already had eight such days. Indeed, only once in three weeks did New Delhi’s daily peak value of fine particles fall below 300, a level more than 12 times the exposure limit recommended by the World Health Organization.
Indians’ indifference to what matters and their warped priorities should not be a surprise. For self-destruction, it is hard for the Rest of the World to match India or Indians.