After weeks of "very poor" and "severe" air, Delhi and adjoining areas witnessed their first improved air quality day of 2019 with the quality index (AQI) recorded at 'poor' levels of 288 due to a sudden increase in the wind speed.

"Overall air quality in Delhi is in the poor category and it is likely to remain in the same zone as surface winds continue to play a major role in dispersing the pollutants," System of Air Quality and Weather Forecasting And Research said in its daily pollution analysis.