Emissions Testing in Nevada

Testing Requirements

Current Testing Requirements in Nevada

Nevada operates the Emission Control Program, which requires annual smog checks for vehicles registered in the urban areas of Clark and Washoe counties. The program is administered by the Nevada DMV. For 1996 and newer gasoline vehicles, the test is an OBD-II diagnostic scan. For pre-1996 gasoline vehicles, a two-speed idle tailpipe test is performed. Diesel vehicles up to 14,000 pounds receive an opacity test on a dynamometer. The DMV operates Emission Labs in Las Vegas and Reno for dispute resolution and waiver processing. Licensed private smog check stations perform the actual testing, and results are transmitted electronically to the DMV.

Who Needs a Smog Check

Gasoline-powered vehicles model year 1968 and newer up to 14,000 pounds registered in the urban areas of Clark or Washoe counties must pass an annual smog check. Diesel-powered vehicles up to 14,000 pounds in the same areas are also required to test annually. A smog check is required at each annual registration renewal, at initial registration (including new residents), and at change of ownership. New gasoline vehicles are exempt for their first three registration cycles. Hybrid vehicles are exempt for five model years. Electric vehicles and vehicles running permanently on propane, compressed natural gas, methane, or butane are exempt. Vehicles model year 1967 and older are exempt. Motorcycles, mopeds, and tri-mobiles are exempt. Vehicles registered as Classic Rod, Classic Vehicle, or Old Timer and driven 5,000 miles or less per year are exempt with an annual odometer affidavit. Diesel vehicles over 14,000 pounds are exempt from the testing program but subject to roadside enforcement.

How Often Tests Are Required

Smog checks are required annually in Nevada, tied to the registration renewal cycle. Passing test results are valid for 90 days from the test date. For vehicles purchased from a Nevada dealer, the test is valid for 180 days. Nevada does not send separate smog check reminders. The registration renewal notice indicates whether a smog check is required.

Where Emissions Testing Is Required

Smog checks are required in the urban areas of Clark County (Las Vegas, Henderson, North Las Vegas, and surrounding communities) and Washoe County (Reno, Sparks, Washoe Valley, and areas north and east of Reno between Interstate 80 and the 40th degree of north latitude). Vehicles based in remote areas of Clark and Washoe counties may be exempt. All other Nevada counties, including Carson City, Elko, Lyon, Douglas, Nye, and Churchill, do not require smog checks.

What Happens During the Test

For 1996 and newer gasoline vehicles, a technician connects to the OBD-II port and checks for stored diagnostic trouble codes, readiness monitor status, and the malfunction indicator lamp. A lit check engine light causes automatic failure. Incomplete readiness monitors result in a "not ready" rejection. For pre-1996 gasoline vehicles, a two-speed idle test measures exhaust pollutants at idle and at 2,500 RPM. Diesel vehicles up to 14,000 pounds receive a dynamometer-based opacity test. A visual inspection checks that emissions control equipment appears functional. Vehicles emitting visible smoke will fail and do not qualify for a waiver. The test typically takes 10 to 20 minutes.

Areas in Nevada That Require Smog Checks

Within Clark County, cities and communities where smog checks are required include Las Vegas, Henderson, North Las Vegas, Boulder City, Enterprise, Spring Valley, Summerlin, and Paradise. Within Washoe County, covered areas include Reno, Sparks, Sun Valley, and Washoe Valley. Cities outside the covered areas do not require smog checks. Carson City, Elko, Fallon, Fernley, Mesquite, Pahrump, Winnemucca, Ely, Lovelock, and all rural Nevada counties are exempt.

How the Smog Check Works in Nevada

Drivers take their vehicle to any licensed smog check station. These are private businesses authorized by the Nevada DMV. No appointment is needed at most stations. Bring your vehicle registration, proof of insurance, and payment. Fees are set by individual stations, not the DMV, and typically range from $20 to $40 plus a $6 emissions certificate fee. The DMV sets maximum fee limits based on an annual survey of hourly labor rates. State inspection facilities do not exist in Nevada; all testing is performed at private stations. If the vehicle passes, results are transmitted electronically to the DMV and registration can be renewed. If the vehicle fails, repairs must be completed and the vehicle retested. If it fails again after qualifying repairs, a waiver may be available. In Clark County, repairs must be performed at a 2G-licensed shop and total at least $450 to qualify for a waiver. In Washoe County, the minimum repair expenditure for a waiver is $200. Waivers are not issued for vehicles emitting visible smoke, vehicles still under manufacturer's warranty, or vehicles with tampered emissions equipment. The DMV Emission Labs can assist with disputes and waiver applications: Las Vegas at 702-486-4981 and Reno at 775-684-3580.