How Often Do You Need a Smog Check in Nevada?

The Direct Answer

Covered Vehicles Test Each Registration Year

“Annual” means once for that registration year. It does not mean every other year. Once regular testing starts, the vehicle needs a result each year. A new exemption can change that.

A standard Nevada smog test is valid for 90 days. You can test before the registration expires. Then renew after the DMV gets the result.

A simple renewal sequence looks like this:

• Review the registration notice and expiration date.
• Complete the smog test within the valid time.
• Confirm that the analyzer sent the result to the Nevada DMV.
• Finish the renewal and pay the DMV charges.

The smog test gives the DMV a result. It does not renew the registration. You still have to finish the renewal. You can use a DMV option or an approved station.

Testing early gives you more time if there is a problem. You can fix it before the registration expires.

Use the Nevada DMV emissions page for current rules. The Smog Busters smog check guide explains the Las Vegas test and what to expect.

Where the Annual Rule Applies

Nevada’s Annual Rule Applies Only in Designated Testing Areas

Nevada’s smog program covers set city areas in Clark and Washoe counties. The same rule does not apply across the whole state. A county name alone does not show if a vehicle is covered.

In Clark County, the test area includes the Las Vegas Valley. It also includes a buffer set by the state. Cars based in Las Vegas, Henderson, and North Las Vegas often fall inside it. Remote areas of Clark County may be exempt. Addresses outside the line may be exempt too.

Washoe County has its own test area. It covers Reno, Sparks, Washoe Valley, and other nearby areas. Some Washoe County towns are outside the program. Check the DMV map if an address is near the line.

The rule follows where the vehicle is based. It does not follow where you drive or get the test. Testing outside your home area does not create an exemption. Nevada uses the address on the vehicle record.

The vehicle’s real home address must be correct in DMV records. Check the record if the renewal notice looks wrong. Check the testing map too. Vehicles based in other Nevada counties are outside this yearly program.

Vehicle Coverage

Model Year, Fuel Type, and Exemptions Decide Which Vehicles Are Covered

Nevada’s yearly program usually covers gas vehicles from 1968 or newer. Their weight does not change this rule. They must also be based in a test area. Gas vehicles from 1967 or earlier are exempt.

Some diesel vehicles also test each year. Their maker’s weight rating must be 14,000 pounds or less. They must be based in a covered area. Diesel vehicles rated at 14,001 pounds or more are exempt. Diesel tests use special licensed equipment.

Common vehicle and registration exemptions include:

• New motor vehicles during their first three registrations
• Hybrid-electric vehicles during their first five model years
• Fully electric vehicles
• Motorcycles and mopeds
• Vehicles that run permanently on qualifying alternative fuels
• Vehicles based outside the designated testing areas
• Certain qualifying Classic Vehicle, Classic Rod, or Old Timer registrations that meet Nevada’s insurance and mileage rules

An exemption lasts only while its rules are met. Most new vehicles start testing at the fourth registration. A qualifying hybrid starts in its sixth model year. Once an exemption ends, a covered vehicle tests each year.

A car moving into a covered Nevada area may need a test. This can happen at its first Nevada registration. A used car sale may also need one. A valid Nevada result may cover the sale.

Smog Busters tests qualifying gas vehicles. Diesel testing is only at E Sahara & Atlantic. Smog repairs are only at approved repair shops. Check the Smog Busters location finder for services, hours, and directions.