Permitting Guidance


The AQD Online Portal is used for new permit applications, renewals, and minor/non-minor modifications for:

  • General/ATO facilities
  • Non-Title V facilities
  • Title V facilities

This portal is also used for submitting asbestos notifications and revisions. Users must create an electronic signature account through Shared CROMERR Services (SCS) to access the AQD Online Portal.

The Dust and Miscellaneous Portal is used for:

  • Dust control permit applications and changes
  • Subcontractor registrations - new and renewals
  • Open burn applications
  • Tanker truck certifications (vapor decals)

First time users must create an account through the Dust and Miscellaneous Portal.


Annual Background Concentrations

Annual background concentrations for major pollutants are available in this spreadsheet.

Dust Sources, Control and Training

Information on Dust Sources, Control and Training and the regulations that apply to each. 

Emission Reduction Credit Program

The Emission Reduction Credit program creates a consistent method for sources to generate ERCs for future use in offsetting emissions in nonattainment areas throughout Maricopa County.

Permit Engineering

Learn more about air quality permits and the Permit Engineering division, including contacts and Planning Area maps.

Performance Testing

Performance tests are conducted according to established procedures in order to quantify emissions and provide an objective means for determining compliance with established emission limits. See our Performance Testing page for more information.

Page reviewed 13 December 2021