Backgrounds and Objectives: Air pollution is very important because of every human being inhales an average of 10 m3 air and its impact on human health. The objective of this study was to evaluating the compare to relative risk and attributed proportion exposure to Nitrogen dioxide in the western half of Iran during 2013.

Materials and Methods: This descriptive study was conducted in Ahvaz, Kermanshah and Bushehr during 2012. In the present study, Data’s was taken from Department of Environment (ADoE) and meteorological organizations of the studied cities. After processing and modification on the basis of meteorological data, data were converted as input file to the Air Q model. Finally, by using epidemiologic formulas such as relative risk (RR) and attributed proportion (AP) estimated the health effects of NO2 in the three studied cites were estimated.

Results: Based on result, the total accumulative number of cardiovascular death attributed to exposure with NO2 in the studied cities was in Ahvaz, Kermanshah Bushehr 45,51 and 6, respectively . According to the research findings, the relative risk of NO2 were estimated attributed to cardiovascular death 1.002. Results showed that the maximum and minimum number of obstructive pulmonary disease attributed to NO2 were observed in Kermanshah and Bushehr with 26 and 5 cases.

Conclusions: The high percentage of cardiovascular mortality and respiratory mortality in Kermanshah can result due to this higher average NO2 in comparison with Ahvaz and Bushehr.