Delhi's air quality remained poor for the third consecutive day with an Air Quality Index (AQI) of 257. However, rain forecasted on Monday is expected to improve the air quality to the moderate category. Five stations in the city were in the very poor category, with Mundka being the most polluted area. The calm winds and low mixing height have contributed to the accumulation of pollutants. The forecast predicts that the air quality will remain in the poor category on Sunday but improve to moderate on Monday and Tuesday.