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Compliance and Enforcement Information
Consequences of Diesel Idling
Learn more about diesel idling and the consequences for maintenance costs of vehicles, health and global warming.
Diesel Idling Restriction Ordinance
Learn more about the Vehicle Idling Restriction Ordinance (Maricopa County Ordinance P-21).
Idle Control Programs / Technologies
Discover existing idle control programs and technologies available to assist owner/operators in controlling their use of diesel idling.
Report Diesel Idling Violations
To report a suspected idling violation, call the Maricopa County Air Quality Department at 602-372-2703 or use our
Air Quality Violation Report Form
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