New Delhi: The air quality of Delhi remained in the "very poor" category with Air Quality Index (AQI) docking at 309 and likely to improve on Sunday (tomorrow), according to the System of Air Quality and Weather Forecasting And Research (SAFAR).
"The overall Delhi air quality is in the low-end of the Very Poor category as forecasted. Surface winds are low and forecasted to improve. A fresh western disturbance is likely to affect the Delhi region from February 21. A marginal improvement in ventilation and lower end of Very poor AQI is forecasted for tomorrow. AQI is likely to improve Very Poor to Poor on February 21 and further improve to Poor on February 22," SAFAR said in its bulletin.
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An AQI between 0-50 is marked good, 51-100 is satisfactory, 101- 200 is moderate, 201- 300 is poor, 301-400 is very poor and 401-500 is considered severe.