New Delhi [India], October 4 (ANI): With monsoon season retreating here, the pollution levels in the city started rising again. The city recorded an average Air Quality Index (AQI) here was recorded as 166 over the last 24 hours, indicating challenging air quality for the national capital. Some of the most polluted areas in Delhi include Anand Vihar recorded an AQI of 231, Mundka with an AQI of 273, AQI of 201 in Loni and the Delhi Institute of Tool Engineering recorded an AQI of 243 which is considered unhealthy and hazardous. Additionally, the current PM2.5 concentration in the city is 5.5 t…