Emissions Inventory

2019 Emission Inventory Report
The Maricopa County Air Quality Department (MCAQD) has a new data tracking system, IMPACT, for Inventory, Monitoring, Permitting, And Compliance Tracking.

Facilities that will be required to submit a 2019 annual emissions inventory (EI) report will be notified by email. The email will be sent to the contacts for each facility. If your contact information has changed, please submit a Contact Update Form to ensure receipt of this notification.

All 2019 annual EI reports must be completed using IMPACT. Paper forms will not be accepted.

Due Dates

Annual EI reports will be due 90 days after MCAQD notifies the facility that an EI report is required.

Title V facilities - notifications have not been sent yet.
Non-Title V facilities - notifications have not been sent yet.

Contact Emissions Inventory



MCAQD 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.

A point source emissions inventory shows annual air pollutant emissions for one specific business location. An emissions inventory may be requested by MCAQD of any facility with an air quality permit in Maricopa County.

Annual emissions inventory report serve a number of purposes:

  • They help determine a source'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 also 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.
  • Inventory data are used as input for air quality modeling to demonstrate attainment of national ambient air quality standards (NAAQS).
Page reviewed 05 February 2020