Even as air quality in Delhi fell to the ‘very poor’ category, city doctors on October 22 reported a 30 per cent surge in respiratory diseases like asthma and chronic obstructive pulmonary disease (COPD). 

A thick layer of smog enveloped Delhi on the morning as the city’s air quality deteriorated to the ‘very poor’ category. According to the Central Pollution Control Board (CPCB), 27 monitoring stations in the national capital fell in the red zone, with an Air Quality Index (AQI) of 317 recorded around 9:00 a.m.