Noida/Ghaziabad, Nov. 6 -- After four days of deteriorating air quality, Greater Noida on Wednesday recorded a visible improvement, moving into the 'moderate' category with an Air Quality Index (AQI) of 187, according to the Central Pollution Control Board's (CPCB) national bulletin released at 4pm daily.

The improvement marked a significant drop from Tuesday's 262 and Monday's 300, while nearby Noida and Ghaziabad continued to remain in the 'poor' zone with AQIs of 215 and 207, respectively. Both cities, however, also showed improvement from the 'very poor' levels seen earlier this week.

On Tuesday, Noida recorded a 'very poor' AQI of 304 and Ghaziabad 325, before both dipped on Wednesday. The two cities, which typically follow similar...