India, Oct. 15 -- Gautam Budh Nagar on Wednesday recorded its second consecutive day of "poor" air quality after a spell of clean air, even as winter approaches and pollution typically spikes due to localised, climatic, and geographical factors.

According to the Central Pollution Control Board (CPCB), Noida recorded an Air Quality Index of 201 (poor) on Wednesday, down from 238 on Tuesday. Similarly, the AQI in Greater Noida was 235, up from 224 on Tuesday.

The spike follows a spell of relatively cleaner air. The AQI in Greater Noida stood at 109 on October 10 and 107 on October 11 before falling to 86 on October 12. It then surged to 235 on October 13. Noida's AQI followed a similar pattern, dropping to 110 on October 10 and 109 on Oct...