Salt Lake City Code Title 12 limits non-essential vehicle idling to two minutes citywide, with stricter enforcement during winter inversions when the Utah Air Quality Board declares mandatory action days under R307 air quality rules.
Under Salt Lake City's anti-idling ordinance, drivers may not idle a stopped vehicle for more than two minutes within any one-hour period. Exceptions cover traffic, emergency vehicles, refrigerated transport, and active loading. The rule was adopted to fight wintertime PM2.5 inversions trapped against the Wasatch Range. SLC police and parking enforcement issue warnings before fines. The Utah Division of Air Quality coordinates mandatory action days through R307-302, when idling near schools draws elevated scrutiny. Drive-throughs and school pickup lines are common enforcement focus areas.
First violation typically results in a warning. Subsequent violations carry fines starting around fifty dollars per occurrence under SLC's civil penalty schedule for environmental offenses.
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