The better air quality in Delhi-NCR is primarily due to improved weather conditions, with strong winds and light rainfall helping to clear the pollutants
The CPCB classifies the air quality index into the following categories: 0-50 (good), 51-100 (satisfactory), 101-200 (moderate), 201-300 (poor), 301-400 (very poor) and 401-500 (severe)
Rainfall across the country's northwest region, a major wheat growing belt, has been almost 80 per cent below normal since the beginning of the year, according to the India Meteorological Department
IMD's latest weather forecast said that the western disturbance is affecting Delhi, causing partially cloudy skies and isolated drizzles in parts of the city on February 19 and February 20
February has brought unreasonably high temperatures with February 17 becoming the second-hottest day of the season. But, rainfall, predicted later this week, could bring back the cold