New Delhi

A layer of smog stuck around Delhi's sky as the air quality in the national capital continue to remain in the 'very poor' category on Thursday morning with an overall Air Quality Index (AQI) at 303.

On Wednesday morning, the overall AQI of the city stood at 329.

The National Capital Region (NCR) also continued to witness bad air as Noida also registered very poor air quality with an AQI of 309.

Meanwhile, the air quality of Gurugram was "moderate" as the city registered 144 on the AQI meter.

The level of PM 2.5 and PM 10 was recorded at 147 in the 'very poor' category and 275 in the 'poor' category respectively in Delhi.

AQI recorded at all major monitoring stations in the national capital also stood in the 'very poor' category.

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Air Quality Index from 0 to 100 is considered as good, while from 100 to 200 it is moderate, from 200 to 300 it is poor, and from 300 to 400 it is said to be very poor and from 400 to 500 or above it is considered as severe.