Chandigarh, Oct. 20 -- At 118, the air quality index (AQI) of Chandigarh on Sunday, a day before Diwali, was moderate, revealed the Central Pollution Control Board's (CPCB) dailybulletin. This figure may go up on Diwali night when residents burst crackers, causing the air quality to deteriorate. However, unlike last year, when Diwali fell in November, the day temperatures are comparatively higher this time, which means the AQI may improve quickly, expertssaid. This is due to a phenomenon called temperature inversion, which prevents pollutants from getting scattered in the air and keeps them like a blanket over the city's air when the temperatures are lower. Furthermore, stubble burning cases, a major contributor to poor AQI, in Punjab have also been on a relatively lower side this time, as per officials. Last Diwali, the AQI had gone up to 395 at the Continuous Ambient Air Quality Monitoring Station (CAAQMS) in Sector 22. The maximum temperature rose from 34degC on Saturday to 34.4degC on Sunday, three degrees above normal. The minimum temperature dropped from 17.5degC on Saturday to 17.2degC on Sunday, a degree above normal. Over the next three days, the maximum temperature will remain between 32degC and 34degC while the minimum willremain between 17degC and19degC. Clear skies will continue in the coming week....