New Delhi: The city recorded the fourth poor day of the month as the air quality index (AQI) worsened to 229 Wednesday. Relief, however, is likely as Delhi is expected to see rain Thursday and Friday.Central Pollution Control Board’s data shows that Delhi recorded a three-day streak of poor air days from Oct 21 to 23. Graded Response Action Plan’s stage I was imposed on Oct 21. However, after winds picked up and rain hit the city, the air quality remained moderate for four days from Oct 24 to 27.However, after winds slowed down Wednesday, the air quality deteriorated to poor. Vivek Vihar was the most polluted station with an AQI of 313 at 6pm. The contribution of stubble burning in Delhi’s PM2.5 was 0.9% Wednesday. At 197, AQI was in the higher range of the moderate category Tuesday.According to Air Quality Early Warning System, which functions under the Union ministry of earth sciences, the air quality is likely to remain moderate from Thursday to Saturday.India Meteorological Department has issued a yellow alert for light-to-very-light rain at most places and moderate rain at isolated areas for Thursday. Rain is likely to be accompanied by a thunderstorm, lightning and gusty winds up to 50kmph. Light-to-very-light rain is expected Friday.“A fall in the maximum temperatures by 2-4 degrees is expected during the next two days due to rain and cloudiness. It may rise by 2-3 degrees thereafter,” said a Met official.The maximum temperature Wednesday was 31.8 degrees Celsius, one degree above normal. It is likely to stay between 26 and 28 degrees Celsius Thursday and 27-29 degrees Celsius Friday.The minimum temperature, which dipped to the season’s lowest at 15.3 degrees Celsius Tuesday, rose marginally to 15.7 degrees Celsius at base station Safdarjung and is likely to rise over the next two days. At 14.8 degrees Celsius, Aya Nagar in southwest Delhi recorded the lowest minimum temperature.