Mumbai witnessed smog across several parts of the city as air pollution levels remained a concern. The city’s air quality index (AQI) was 103 in the moderate category on Monday evening. (PICS/ SHADAB KHAN)

Delhi recorded an Air Quality Index (AQI) of 187 at 8 am on Monday, placing the national capital in the 'moderate' category, according to the Central Pollution Control Board (CPCB). (Pics/PTI)