Air quality in Delhi has once again deteriorated and slipped from poor to very poor category. According to the Central Pollution Control Board, the Air Quality Index, AQI in Delhi was recorded today morning at 323 which was 292 on Sunday and 298 on Saturday. PM10 pollutants level was found at 213 micro-gram per cubic meter while PM2.5 level at 323 micro-gram this morning. An AQI value between 301- 400 is classified as very poor. <br/> <br/>However, forecasters have emphasised that the city's air quality will remain in the very poor category and chances of it deteriorating further in the coming days is less as incursion of pollutants from external sources like stubble burning has stopped. The recent light drizzle in Delhi and its surrounding areas also helped wash out the accumulated particulates resulting in season's best quality air over the last two-three days.