Cities are the most objective symbols of interaction between man and environment, along with the increasing population and the progress of urbanization and industrialization and environmental deterioration, public's desire for improved air quality is increasing. Mashhad, as the biggest religious town in Iran, is the second air polluted city after Tehran. There are more factors contributing to the air pollution in Mashhad .the main reason for the high air pollution in the city is the exhaust pollution from the motor vehicle and aging transport sector. This paper presents results of an empirical study recently conducted in Mashhad aimed at estimating the public’s willingness-to-pay (WTP) for improved air quality. A statistical technique known as contingent valuation method (CVM) model is used here. According to the results of this research, paying more attention to Mashhad environmental issues are recommended. The results will help policy makers to investigate public’s tendency to improve air quality and get the policy makers represent the ways and suggestion to reduce air pollution

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