Updated On: 14 December, 2021 11:35 AM IST | New Delhi | ANI
As per the government agencies, an AQI between zero and 50 is considered 'good', 51 and 100 'satisfactory', 101 and 200 'moderate', 201 and 300 'poor', 301 and 400 'very poor', and 401 and 500 'severe'

Pic/PTI
With the Air Quality Index (AQI) at 328, the air quality in the national capital has again deteriorated to the 'very poor' category, the System of Air Quality and Weather Forecasting And Research (SAFAR) portal of the Ministry of Earth Sciences reported an air informed on Tuesday.
The air quality of the NCR region of Noida has also slipped to the 'very poor' category. The AQI stands at 333 in the NCR region. Meanwhile, the air quality of Gurugram has improved from 'poor' to 'moderate' category with the AQI at 140.