LUCKNOW, Nov. 9 -- After recording a 'poor' Air Quality Index (AQI) on November 5, the city's air once again deteriorated into the same category on Saturday, triggering fresh concern over rising pollution levels as winter approaches.

According to Central Pollution Control Board (CPCB) data at 5 pm, the city's overall AQI stood at 256, placing it in the 'poor' zone. All six live monitoring stations across Lucknow registered worrying readings, with both PM2.5 and PM10 levels marked in dark red -- indicating 'very poor' and 'severe' categories respectively. The CPCB categorises AQI values between 201 and 300 as 'poor', 301-400 as 'very poor', and above 400 as 'severe'. On November 5, the state capital had recorded an AQI of 254. The AQI sto...