Emissions Inventory

The Maricopa County Air Quality Department (MCAQD) Emissions Inventory (EI) unit collects, reviews, stores, and manages air pollution emissions data for stationary sources in Maricopa County. The EI unit also collects emission fees from Title V sources and provides data to county, state, and federal agencies.

An emissions inventory shows annual air pollutant emissions for one specific business location. An emissions inventory may be requested for any facility operating under a permit issued by the MCAQD.

Annual emissions inventory reports serve a number of purposes:

• They help determine a facility's compliance with its air quality permit conditions as well as Maricopa County rules and regulations.
•  They help identify pollutant sources that may need new or additional controls, providing a basis for improved air pollution control strategies.
•  They provide a means of assessing progress in achieving reductions from existing controls.
•  They provide the basis for determining annual emission fees for Title V sources facilities.
•  Inventory data are used as input for air quality modeling to demonstrate attainment of national ambient air quality standards (NAAQS).