The figure uses data from World Air Quality Index and updates the page every 30 minutes.

AQI Air Pollution Level Health Implications
0-50 Good Air quality is considered satisfactory, and air pollution poses little or no risk.
51-100 Moderate Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.
101-150 Unhealthy for Sensitive Groups Members of sensitive groups may experience health effects. The general public is not likely to be affected.
151-200 Unhealthy Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects.
201-300 Very Unhealthy Health warnings of emergency conditions. The entire population is more likely to be affected.
300+ Hazardous Health alert: everyone may experience more serious health effects.
source: aqicn
Air Quality Index of Major Cities in Nepal