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Air quality in the national capital continued to be in the "very poor" category on Tuesday, which is expected to intensify in next two to three days.
The air quality is very poor and is expected to increase gradually in next two to three days, but be well within the 'very poor' limit, the SAFAR said in a report.
"At present, winds are unfavourable for dispersion but it may slow down any time with fall in temperature which is expected. Humidity is still high which is unfavourable. Fire counts from stubble burning declined and will have marginal impact," it said.
The overall air quality index (AQI) was recorded at 349, which comes under the 'very poor' category, according to the Centre-run System of Air Quality and Weather Forecasting (SAFAR).
The Central Pollution Control Board (CPCB) data said 20 areas in Delhi recorded 'very poor' air quality and 13 'poor' air quality.
On Tuesday, the PM2.5 particles in the air with a diameter of less than 2.5 micrometres level was recorded at 227, while the PM10 level was recorded at 358, the CPCB data said.
An AQI between 0 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'.
