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Air Pollution has been one the major problems for large municipalities such as Shiraz. Advanced and accurate tools and measures for evaluating private goods already exit. But, tools and measures for evaluating public goods such as air quality is evolving and amending constantly .In this article after reviewing approach developed to evaluate air quality (Contingent valuation Method, CVM) is selected and then Marginal Willingness to pay (MWTP) is being used to measure air quality for Municipality of shiraz .For this research, 750 households through stratified random approach were
being chosen to report to a questionnaire along with the questionnaire
a graph including four pictures to represent different air qualities were being presented respondents.
The results of the research shows that in the city each Shirazian is willing to pay 2970 Rrials to keep existing air quality. At the present time only 900 Rials is allocated for the goal and only 30% of what each individual wants to be allocated is being used so.