Delhi's air quality saw a temporary improvement, with the AQI dropping to the 'poor' category (around 234) on Thursday, a significant rise from the previous 'severe' levels. This respite was attributed to favorable wind conditions. However, air quality deteriorated again by Friday, re-entering the 'very poor' category (around 305-310) due to decreasing wind speeds and fog. Forecasts indicate the 'very poor' air quality is likely to persist for the next six days, with vehicular emissions and pollution from neighboring regions remaining significant contributors.