Tucson and Pima County coordinate on vehicle idling restrictions tied to air-quality compliance, with diesel anti-idling rules at schools and limits on prolonged idling near residences during PM10 and ozone advisory days.
Pima County Code Title 17 (Air Quality), administered by Pima County Department of Environmental Quality, restricts heavy-duty diesel idling near schools and during high-pollution advisory days, applying within Tucson city limits. Tucson supports compliance through CAAP fleet electrification and anti-idling signage at municipal facilities. Drivers can be cited for excessive idling exceeding posted minute limits when stationary, with exceptions for traffic, emergency vehicles, and extreme-temperature occupant safety. Enforcement is complaint-driven through PDEQ.
Civil penalties typically start near $100 for first violations and increase for repeat offenses or fleet operators. Notices come from PDEQ inspectors after observed or reported idling.
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