Maricopa County Air Quality Department Rule 322 caps idling for heavy-duty diesel vehicles over 14,000 pounds at five minutes in any sixty-minute period within Phoenix. Phoenix Chapter 23 noise rules also constrain prolonged engine idling near homes.
Maricopa County Air Quality Department Rule 322, Restrictions on Engine Idling, applies countywide including Phoenix and limits idling of diesel-powered vehicles with gross weight rating above 14,000 pounds to five minutes within any sixty-minute window. Exemptions cover traffic, mechanical inspections, refrigeration units, sleeper-berth rest periods under federal hours-of-service rules during extreme weather, and emergency operations. The rule complements the federal SmartWay program and supports Maricopa nonattainment status for PM-10 and ozone. Phoenix Chapter 23 noise ordinance separately restricts prolonged residential engine noise. Light-duty passenger vehicles are not covered by Rule 322 but face Phoenix anti-warming guidance during ozone high-pollution advisories.
Rule 322 violations carry civil penalties up to $10,000 per day per occurrence assessed by the Maricopa County Air Quality Department. Drivers and motor carriers may both be cited, and repeat offenders face escalated fines plus possible state air-quality referral.
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