Emissions Inventory

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2019 Emission Inventory Report
The Maricopa County Air Quality Department (MCAQD) has a new Online Portal for online inventory, monitoring, permitting, and compliance tracking. The portal will allow users to submit and track applications, reports, and documents electronically to MCAQD. Some system functionalities include:

  • Create and submit an Emissions Inventory
  • Submit applications
  • Update facility and contact information
  • Submit compliance reports
All 2019 annual EI reports must be completed using the AQD Online Portal (IMPACT). Paper forms will not be accepted.

Please thoroughly review the ADQ Online Portal (IMPACT) webpage, and watch a recording of an emissions inventory workshop, to learn how to login to the AQD online Portal to complete your EI report.

Due Dates

The 2019 annual emissions inventory reports were due on May 31, 2020 at 11:59 PM.

Contact Emissions Inventory

Phone: 602-506-6790


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.

An 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 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 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 facilities.
  • Inventory data are used as input for air quality modeling to demonstrate attainment of national ambient air quality standards (NAAQS).
Page reviewed 02 June 2020