Mumbai recorded the worst air quality of this season on Monday since the withdrawal of the monsoon on October 10. At least nine AQI monitoring stations in Mumbai crossed AQI of 200, coming into 'poor' and 'very poor' categories. Bandra Kurla Complex (BKC) recorded an AQI reading of 334, followed by 274 at Colaba (Navy Nagar) and 268 at Deonar.