India, Nov. 3 -- A layer of haze returned to Gautam Budh Nagar district on Monday as air pollution levels deteriorated, with Noida recording an air quality index (AQI) of 327 in the "very poor" category and Greater Noida recording an AQI of 287 "poor", according to UPPCB AQI data on Monday afternoon.

The deterioration followed a period of comparatively better air quality in October.

Monday's reading of 327, therefore, marks a return to the "very poor" band after several months of comparatively lower readings this year.

Monitoring station readings showed considerable variation across Noida. Sector 62 recorded an AQI of 389, followed by Sector 39 at 351 and Sector 150 at 332. Sector 125 recorded 290, Sector 116 recorded 299 and Sector 1 ...