Delhi’s AQI reached 384 on Diwali morning, nearing “severe” levels, while Mumbai’s air remained moderate. Citywise data and expert analysis. On Diwali morning, Delhi recorded an Air Quality Index (AQI) of 384, placing the city in the “very poor” category and nearing the “severe” threshold. Several areas in the National Capital Region also reported unhealthy air, while Mumbai’s AQI remained in the moderate range.