Ambient air monitoring is the monitoring of the quality of the air in a particular geographical area. It is not concerned with monitoring the emissions from chimney stacks. The usual substances monitored under ambient air monitoring are dust deposition, PM10, PM2.5, NOx and SOx. In some countries ambient monitoring is carried out using permanent monitoring stations. This data is usually available free of cost. The ambient air monitoring group attached to M/s Gaheli Environmental Labtotary has been continuously analyzing samples over a range of parameters. These parameters are PM10, PM2.5, Sox, NOx, Ozone, Lead, Arsenic, CO, Benzene, Benzo-pyrene, Ammonia, and Nickel. The analysis of data is performed by the experienced staff within stipulated time and precision.