Clark County and Henderson follow Nevada Division of Environmental Protection rules limiting heavy-duty diesel idling to five minutes in most circumstances. Aimed at PM2.5 and ozone non-attainment in the Las Vegas Valley airshed.
The Las Vegas Valley including Henderson is in EPA non-attainment for ground-level ozone. Clark County Department of Environment and Sustainability enforces a five-minute heavy-duty diesel idling cap in delivery zones, school loading areas, and commercial yards. Exemptions cover engine warmup below 32 degrees, traffic congestion, and required power-takeoff operations. Construction equipment at Inspirada, Cadence, and other master-planned community build-outs must post idling-policy signage. Passenger vehicles are not directly regulated but are encouraged to limit idling.
Heavy-duty diesel idling violations are enforced by Clark County DES with citations starting around $100 for first offense and increasing for repeat commercial fleet operators.
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