RAPID/BulkTransmission/Arizona/Air Quality

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Arizona Bulk Transmission Air Quality Assessment(15-AZ)

In Arizona, bulk transmission project construction activities and equipment typically do not require an Air Quality Permit from the Arizona Department of Environmental Quality, Air Quality Division. The temporary use of a portable diesel generator that qualifies as a “nonroad engine” under 40 C.F.R. § 89.2 does not require an Air Quality Permit pursuant to Ariz. Admin. Code § 18-2-302(A). Other construction equipment (e.g., brazing, soldering, and welding equipment that does not emit hazardous air pollutant metals) for bulk transmission projects is often categorized as a “trivial activity” and is therefore exempt from obtaining an Air Quality Permit. Ariz. Admin. Code § 18-2-101.


While mobile sources, such as nonroad engines, do not require an Air Quality Permit, a developer must comply with Arizona’s mobile source rules contained in Ariz. Admin. Code §§ 18-2-801–805, which require a developer prevent mobile sources from emitting smoke or dust in excess of 40% opacity. Ariz. Admin. Code § 18-2-801(B). Arizona’s mobile source rules also contain equipment-specific limitations in Ariz. Admin. Code §§ 18-2-802–805. A developer must comply with Arizona’s rules for motor vehicles contained in Ariz. Admin. Code §§ 18-2-1001–1030.


A developer must also comply with fugitive dust rules contained in Ariz. Admin. Code §§ 18-2-601–610, which require a developer to take reasonable precautions to limit excessive amounts of particulate matter from becoming airborne and to keep dust and other air contaminants to a minimum through the use of good modern practices. Ariz. Admin. Code §§ 18-2-604(A)–(B); 18-2-606; 18-2-607. The developer should consider the project’s impact on air quality and comply with federal and state law.


Note: If a developer’s project extends into Maricopa County, Pima County, or Pinal County, the developer should consult the Maricopa County Air Quality Department (MCAQD), the Pima County Department of Environmental Quality (PCDEQ), or the Pinal County Air Quality Control District (PCAQCD), respectively. MCAQD, PCDEQ, and PCAQCD each have their own permitting programs, and the developer must apply for applicable permits with those programs. U.S. Environmental Protection Agency – Clean Air Act Permitting in Arizona.

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Determine Which State and Federal Permits Apply

Use this overview flowchart and following steps to learn which federal and state permits apply to your projects.