Chandigarh, Nov. 19 -- The air quality index (AQI) of the city has turned satisfactory, dropping from 137 on Monday to 93 on Tuesday as per the daily bulletin released by the Central Pollution Control Board (CPCB). This year, the city's air quality has remained much better than the previous year. On November 18 last year, the city's AQI had stood at 268, which is considered poor (see box).

AQI between 51 and 100 is considered satisfactory but can cause minor breathing discomfort to sensitive people. AQI between 101 and 200 is considered moderate and can cause breathing discomfort to the people with asthma, lung and heart diseases. AQI between 201 and 300 is considered poor and can cause breathing discomfort to most people on prolonged ex...