Western Iran, for example, Kermanshah, is one of the industrial cities of Iran that due to industrial development and
transport development and located in the west side of country, the levels of its air pollutants have a lot of fluctuations.
So the aim of this study is to determine the trend of variations in Kermanshah air pollutants (sulfur dioxide, ozone,
nitrogen oxides, carbon monoxide and particulates).This is a descriptive - analytical study, so that the data of various
air pollutants in Kermanshah city during the period of 5 years (2006-2011) obtained from the Environmental
Protection Agency of Kermanshah, then data analysis was attempted using SPSS and Excel software. Results showed
that the highest average concentrations of pollutants based on years, season and months were 2010, summer and July
for O3, 2005, autumn and December for NO, 2008, spring and April for NO2, 2008, summer and July for PM10, 2008,
summer and September for SO2 and 2005, Autumn and June for CO. Increasing the some pollutants such as O3, NO
and NO2 from 2006 years onwards is related to increasing the vehicle and industries. Therefore, it is essential to
understand the causes of increasing and reducing the emissions is needed to Public education to deal, harm reduction
and management measures
