Chandigarh, Nov. 15 -- Having remained largely satisfactory post Diwali, the city's air quality deteriorated to the moderate category on Saturday amid falling temperatures and changing wind patterns.

Experts, however, said the air quality index (AQI) could improve as a Western Disturbance is active over the region, and may bring rain on Sunday. Some parts of the city also experienced drizzle on Saturday evening.

According to the daily bulletin issued by the Central Pollution Control Board (CPCB), the city's AQI - 24-hour average of readings from the three monitoring stations in Sectors 22, 25 and 53 - stood at 111 on Saturday.

An AQI of 0-50 is classified as good, 51-100 as satisfactory, 101-200 as moderate, 201-300 as poor, 301-400 as...