This paper presents a digital processing approach for measuring gaseous air pollutants in Iran which is one of the most polluted countries. Measurement of pollutant gases is essential for health of human and living things. The present study proposes a distributed wireless air quality monitoring system which measures and calculates the ppb value of ten gases including SO2, NO2, NOx, O3, CH4, H2, CO, NH3, Benzene, and Alcohol. This system includes a gas measuring device, a database and an user interfaces. The gas measuring device can measure the pollutant gaseous in variant places, and sends them to database. Proposing a database for storing the value of gaseous pollutants makes the data retrievable and provides accessibility to data anywhere and anytime. Finally, we defined concentration of gaseous pollutants in Kermanshah city and results show that printer home produces O3 and NO2 and heavy traffic produces CO, CH4, Ben and NOx.