To evaluate the general air quality conditions in the city and to provide the basis for analysing long term trends of pollution concentrations. To provide the data for subsequent development of air quality standards and pollution prevention and control programme for the city. The Shimla town is located at intersection of 30 o 31' North latitude and 77 o 21' East longitudes. The average elevation of the town is 2000mts.from MSL with minimum and maximum elevation range from 1600mts. to 2700mts. respectively. The general topography of the town is highly uneven.
Occasional rainfall is experienced throughout the year.
Station No. 1 is located at Takka Bench on the Ridge Maidan at an elevation of about 2210mts. The monitoring is being done on every Monday, Wednesday and Friday in a week. The monitoring is being done on every Tuesday, Thursday and Saturday in a week. Located at Sector-IV, residential area of the town falls under 'B' category of Residential Area Zone. The values of NOx was also observed within permissible limits.