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'.
The air quality in the national capital has deteriorated today and has slipped to the 'severe' category, according to the System of Air Quality and Weather Forecasting And Research (SAFAR).
The air quality in the national capital has further deteriorated on Friday and has slipped to the severe category, according to the System of Air Quality and Weather Forecasting And Research (SAFAR).
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