Air quality models are used to determine the ambient concentrations of regulated pollutants attributable to various sources. They also are used to develop State Implementation Plans and to evaluate permitted industrial sources. In most cases, modeling is the only means of demonstrating whether a new source can meet ambient air quality standards or whether proposed control measures will bring a nonattainment area back into attainment.

ADEQ has expanded its air quality modeling capabilities to include the use of the Urban Airshed Model. This three-dimensional, photochemical air quality model is currently being used to develop the Phoenix area ozone nonattainment plan. ADEQ requires a high degree of modeling expertise and extensive data input. The Urban Airshed Model enables ADEQ to make more accurate predictions of pollutant concentrations. We hope to apply this model to future carbon monoxide and particulate nonattainment area plan modeling scenarios.

• Air Monitoring Network Plan
• Permit Modeling
• SIP Modeling
• Air Dispersion Modeling Guidelines for Arizona Air Quality Permits
• EPA Regulatory Models