This study aims to value air quality from the urban housing market in Yogyakarta City. It is also provides estimation of marginal willingness to pay for the air quality improvement and estimation of the consumer surplus due to reduced of air quality. The methodological framework for estimation is based on a hedonic price model. The result of hedonic price method concludes that by adopting a two-stage estimation procedure to estimate the relationship between air quality and property value, on the average, an increase in the level of O3 by one percent will increases the property price by 0.063 percent. We estimated the marginal implicit price for reducing O3 is about Rp9 million. People are willing to pay an additional amount of 1.07 percent for a reduction in O3 by one percent. The average consumer surplus per person for a ten percent reduction in O3 is Rp30 million. By using a health production function and demand function mitigation can be seen that the medical history of the individual has effect on the number of working days lost. Meanwhile, O3 pollution has positive effect on the amount of medical expenses for mitigation. Decreasing in O3 pollution causes a decrease in the level of medical expenses to mitigate. Various diseases such as asthma, cough, and fever caused by pollution also affect the amount of medical expenditure for mitigation. Therefore, it is important to reduce the negative impacts of air pollution. Government and private sector support is needed to improve the quality of the environment.