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Background & objective: Air pollution is one of the major factors threatening human health and our environment. This study aimed at the comparative investigation of Air Quality Health Index (AQHI) and its application in the city of Tehran since 2007 to 2014.

Materials & Methods: This Study was a descriptive–analytic one. First, the required data were taken from Department of Environment and the Air Quality Control Company. The data were validated by the World Health Organization criteria. The air quality health index was measured based on the air quality standard tables and classified into low, medium, high and very high degrees. Results: The results show that according to air quality health index, the level of air pollution in Tehran has been undesirable since 2007 to 2014 and in 95%, 92%, 73%, 65%, 57%, 65%, 52%, 46% of days Air quality has exceeded the standard level respectively. So, the level of risk has been high and sometimes very high.

Conclusion: As a result, due to high level of air pollution and its dangerous effects, proper planning and management should be considered in environmental health sectors to control and reduce air pollution.