The air quality in the national capital continued to remain in the 'very poor' category on Monday morning with an overall Air Quality Index (AQI) at 311, according to the System of Air Quality and Weather Forecasting And Research (SAFAR). In light of the air quality standard, SAFAR issued an advisory to reduce heavy exertion. 

As per SAFAR's prediction, the AQI in Delhi will deteriorate to 321 and will remain in the 'very poor' category on Tuesday. 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'.