The air quality in Dlhi-NCR has deteriorated even before the knock of winter with highest AQI level 547 recorded at Knowledge Park in Greater Noida on Monday morning. The situation can be gauged from the fact that in the early days of October, breathing in Delhi has become difficult. The effect of burning straw in neighboring states is now visible in Delhi-NCR as Delhi's climate deteriorated for the second consecutive day. On Monday, the air quality index level crossed 300 in many areas of Delhi