Smog Technician and Emissions Inspector License: How It Works by State

An emissions inspector license is permission to inspect and certify a vehicle's emissions control systems under one specific state or local program.

California splits the inspector and repair roles into two separate licenses: the BAR Smog Check inspector license covers inspecting and certifying emissions control systems, the separate repair technician license covers diagnosing, adjusting and repairing them, and neither covers the other's work.

Programs also restrict who may perform the inspection.

In New Mexico's Air Care program, only a person certified by the program manager, with a current certificate displayed on the premises, may perform any part of an inspection.

Pennsylvania's rules require that the emission inspection be completely performed by certified emission inspectors holding a Bureau-issued certification card and a valid driver's license, at an appointed emission inspection station.

The issuer varies.

The California Bureau of Automotive Repair (BAR), Arizona's Department of Environmental Quality (ADEQ), Georgia's Environmental Protection Division (EPD), Ohio EPA and Virginia's Department of Environmental Quality (DEQ) each run their state's credential.

The Nevada DMV, New Jersey's Motor Vehicle Commission (MVC), PennDOT and the Texas Department of Public Safety (DPS) run the others.

Others are county, city or shared programs: the Salt Lake County Health Department in Utah, the City of Albuquerque's Vehicle Pollution Management Division (VPMD), and Missouri's St. Louis-area Gateway Vehicle Inspection Program.

The State Highway Patrol's Motor Vehicle Inspection Section runs that program with the Department of Natural Resources.

Massachusetts trains and certifies its inspectors through the Registrar of Motor Vehicles together with MassDEP, and Louisiana's mechanic inspectors add emissions training for stations in its five-parish non-attainment area.

An inspector license is also a different credential from a mechanic certification like Michigan's.

Michigan certifies the people who repair motor vehicles — since December 31, 1980, a person there may not work as a specialty or master mechanic unless certified under the Motor Vehicle Service and Repair Act — and separately registers the repair facilities themselves.

Where a state also credentials the repair side of emissions work, that repair credential carries its own training, exams and renewal, as the inspector-versus-repair-technician section below shows.

If you want the work itself — duties, employers, training routes and pay — the smog technician career guide covers the role.

These are the programs that credential the individual who inspects, with the requirements each publishes.

Geography matters as much as the requirements: several programs cover only named counties or parishes.

Arizona.

ADEQ licenses fleet-station and state-station emissions inspectors under Arizona Administrative Code R18-2-1016, and applicants must pass a practical and a written examination with a score of at least 80%.

Licenses renew annually, and an inspector whose license has expired may not inspect vehicles.

A nondiesel inspector applicant who fails the written exam must complete the state training program before re-examination.

The state's official inspection stations are run by an independent contractor under Arizona Revised Statutes 49-545, and that contractor's inspection staff are its employees, not state workers.

California.

BAR licenses Smog Check inspectors to inspect and certify vehicle emissions control systems; the license does not cover diagnosis or repairs.

The application fee is $20 and renewal is $20 every 2 years.

Colorado.

State law provides for an emissions inspector license and an emissions mechanic's license, with applications on forms the Department of Revenue's executive director prescribes.

A license requires completing the required training and passing a written certification test developed by the Air Quality Control Commission and administered by the Department of Public Health and Environment; the Department of Revenue issues the licenses, and they are valid for two years.

Colorado DMV lists Air Care Colorado among the emissions testing options in Adams, Arapahoe, Boulder, Broomfield, Denver, Douglas, Jefferson, Larimer and Weld counties.

Connecticut.

The program, running since 1983, tests vehicles every two years through a network of more than 200 privately owned automotive service facilities administered by the contractor Opus Inspection; the emissions test fee is $20.

The individual credential is the Certified Test Inspector (CTI): hold a valid driver's license, complete the self-paced online computer-based training (videos and PowerPoint, usually several days to a week), then call the Opus Help Desk for access to the online CTI certification exam.

CTIs recertify every two years.

Georgia.

Georgia's Clean Air Force (GCAF) is the emissions program for 13 metro-Atlanta counties: Cherokee, Clayton, Cobb, Coweta, DeKalb, Douglas, Fayette, Forsyth, Fulton, Gwinnett, Henry, Paulding and Rockdale.

For the 2026 registration period, 2002-2023 model-year gasoline cars and light trucks up to 8,500 lb GVWR there need an annual test.

EPD certifies inspectors under Rule 391-3-20-.11: submit an Inspector Certification Application, be at least 18 before attending inspector training, complete EPD-approved training and analyzer (GAS) manufacturer training, then pass a written and practical proficiency test.

The Georgia written test pass mark is 80%, and an EPD inspector certificate is valid two years.

Renewal applications are due at least 30 calendar days before expiry and require EPD-approved retraining plus another pass of the written test; a lost ID badge costs $25 to replace.

New inspectors attend a two-day training course before the examination, while renewing inspectors view a certification presentation video or attend a one-day recertification course and pass the exam.

Louisiana.

Louisiana's mechanic inspectors must complete an MVI training program at a state-accredited, department-approved post-secondary institution — a community college or vocational-technical school.

Inspectors at stations in the five-parish non-attainment area (East Baton Rouge, West Baton Rouge, Ascension, Livingston and Iberville) also need emissions-testing training, and vehicles there get only a 1-year inspection certificate.

Under Act 701 of 2026, the state's new inspection regime takes effect January 1, 2027 for parishes outside the Clean Air Act I/M area, and in the I/M parishes only if and when U.S. EPA approves the state's proposed State Implementation Plan amendments.

Massachusetts.

A person conducting vehicle inspections must be trained and certified by the Registrar of Motor Vehicles and MassDEP, and provide proof of certification and a valid driver's license.

The state runs a combined safety and emissions inspection at licensed private inspection stations, with a private Network Contractor running the enhanced emissions and safety program under contract to MassDEP and the RMV; vehicles are inspected annually.

An inspector's or station's license is suspended for at least 180 days for intentionally passing a vehicle improperly on the emissions test, and a second violation within three years means revocation.

Missouri.

The Highway Patrol's Motor Vehicle Inspection Section oversees the businesses enrolled as inspection stations.

Station permits cost $10 per year for safety, $100 per year for emissions, or $110 per year for combined safety and emissions.

Emissions stations in the St. Louis-area non-attainment area enroll through the Gateway Vehicle Inspection Program (GVIP), administered with the Department of Natural Resources.

The Patrol's inspector/mechanic permits, issued free of charge and valid for three years, authorize safety inspection of motor vehicles or, on the restricted permit, motorcycles, motor tricycles and autocycles only.

Our research did not establish GVIP's training and testing requirements for emissions inspectors, so confirm them with the program.

Nevada.

Nevada licenses individual inspectors as Class 1 approved inspectors (testing) or Class 2 approved inspectors (testing plus diagnosis, repair and service of emission controls) under NAC 445B.485.

Testing runs through licensed private authorized stations overseen by the DMV's Compliance Enforcement Division, with annual emissions tests for qualifying vehicles based in the urban areas of Clark County and Washoe County.

A Class 1 applicant must apply to the DMV, show a certificate of competence from an approved exhaust gas analyzer manufacturer (or demonstrate the equipment), complete DMV-approved training for each rating, score at least 80% on the DMV written test, and perform a practical demonstration.

A Nevada Class 2 applicant must have met the Class 1 requirements within the last 12 months.

From there, the applicant either passes the Class 2 written test with 80% or higher or holds current ASE Advanced Engine Performance Specialist (L1) certification that stays valid through the 24-month license period.

New Jersey.

The MVC Inspector License (INL) requires completing an 8-16 hour course at an approved third-party training provider, passing a written exam with at least 80%, and passing a hands-on emission test demonstration.

The license fee is $50 and the license is valid for two years.

Basic (non-commercial) vehicles are inspected once every two years — new vehicles get a five-year first inspection — either at state inspection facilities or at licensed private inspection facilities.

New Mexico.

The only emissions program the official sources show for New Mexico is local: the Albuquerque-Bernalillo County Air Care program, run by the City of Albuquerque's Vehicle Pollution Management Division under 20.11.100 NMAC.

Testing is biennial for vehicles 1992 or newer and under 10,001 lb registered in Bernalillo County, and the division provides free inspector training and certification while supporting more than 120 Air Care inspection stations.

Air Care inspector certificates are valid for 12 months and must be renewed during the month they expire; a certification lapsed more than 90 days can mean retaking the week-long certification class instead of the recertification class.

The rule itself lists a $35 certification or annual recertification fee, while the city says the training is free.

North Carolina.

The emissions credential stacks on the safety one: an emissions inspection mechanic must already hold a safety inspection mechanic license and complete a separate DMV-approved eight-hour emissions course, passing a written test and a hands-on emissions inspection.

A safety inspection mechanic license expires four years after issue; an emissions inspection mechanic license expires after two years, and renewal requires a DMV-approved four-hour emissions refresher course — written and hands-on — within nine months before applying.

Vehicles in 19 counties get the OBD emissions inspection alongside the annual safety inspection, which continues statewide.

State law sets the fees at $12.75 for safety-only and a maximum of $23.75 for the combined emissions and safety inspection, plus authorization charges of $0.85 and $6.25 respectively.

The North Carolina emissions side is scheduled to shrink: Session Laws 2023-134 and 2026-41 will end emissions testing in all 19 emissions counties, but only after U.S. EPA approves the revised State Implementation Plan.

EPA proposed approval on May 8, 2026 and was still reviewing public comments as of October 2026.

Once it takes effect, emissions mechanic licenses in those counties become unnecessary.

Ohio.

Ohio EPA certifies emissions inspectors: applicants must be at least 18, apply, and agree in writing to inspect per the rules, then complete the program contractor's training (per 40 CFR 51.367) and score at least 80% on both the written exam and a hands-on demonstration.

Under OAC 3745-26-13, Ohio EPA may require recertification training and testing and can suspend or revoke a certificate immediately for non-compliance; the rule states no fixed renewal term.

The program's structure is set to change.

Under ORC 3704.14 the existing contract can be extended up to 24 months beginning July 1, 2025, and before that extension expires the state must contract a vendor for a decentralized inspection and maintenance program in each federally mandated county.

That vendor must use established local businesses, auto repair facilities or leased properties as testing locations.

Pennsylvania.

PennDOT certifies safety and emissions inspectors through programs at schools under contract with the Department.

An emissions inspector must be at least 18, hold a valid driver's license, complete a PennDOT-approved certification course and pass the prescribed tests — under 67 Pennsylvania Code 177.408, a written test with at least 80% correct plus a demonstration of a complete emission inspection.

Certification renews through a recertification course and test every two years, and the rules cap inspection throughput at 12 vehicles per hour on one- or two-speed idle tests, 6 per hour on ASM equipment, or 12 OBD-I/M checks per hour.

Pennsylvania's rule text names a Philadelphia Region (Bucks, Chester, Delaware, Montgomery and Philadelphia) and a Pittsburgh Region (Allegheny, Beaver, Washington and Westmoreland), with other regions listed as pending certification; the counties actually enforced may differ, so confirm the current map with PennDOT.

Emission testing itself is a decentralized test-and-repair system through privately owned, Department-certified stations.

It covers gasoline model-year 1975-and-newer vehicles of 9,000 lb GVWR or less registered in an I/M county or region, inspected annually alongside the safety inspection.

Current-model-year vehicles and vehicles driven under 5,000 miles a year are exempt.

Rhode Island.

A Rhode Island Certified Motor Vehicle Inspector must be at least 18, hold a valid driver's license and complete a DMV-approved safety-inspection training course; the DMV runs the training and testing monthly at the CCRI Warwick campus.

An inspector who also performs emissions inspections completes an additional class run by the state's Emission and Safety Inspection Program Management Company.

The program is the decentralized Authorized Inspection and Repair Station (AIRS) system, and the $55-per-vehicle emissions-and-safety fee is split so the station owner keeps $19.

Texas.

DPS certifies vehicle inspectors by endorsement: 'C' for any vehicle requiring a commercial inspection report and 'E' for any vehicle requiring an emissions inspection report, through DPS training and an exam.

DPS listed 17 emissions counties — Brazoria, Fort Bend, Galveston, Harris, Montgomery, Collin, Dallas, Denton, Ellis, Johnson, Kaufman, Parker, Rockwall, Tarrant, Travis, Williamson and El Paso — and said Bexar County joins them from November 1, 2026 under House Bill 3297, with the emissions test price there set at $18.50.

Utah.

Emissions testing is run by the local health departments of Cache, Davis, Utah, Weber and Salt Lake counties rather than a statewide agency.

Salt Lake County's Health Regulation #22 defines an emissions Inspector as a person at least 18 who has completed all certification requirements and holds a current Certificate of Qualification issued by the Department.

Salt Lake Community College delivers the county's technician training — register for its 'Applied Emissions' course, listed at $180, with prices subject to change — and the Utah Highway Patrol separately licenses safety inspectors.

Virginia.

DEQ runs the emissions inspection program in the Northern Virginia program area: Arlington, Fairfax, Loudoun, Prince William and Stafford counties and the cities of Alexandria, Fairfax, Falls Church, Manassas and Manassas Park.

An inspector applicant must hold a valid driver's license, demonstrate analyzer operation, complete DEQ-approved training and pass a qualification test scoring 80% or higher.

Licenses are valid for periods set by the department, not exceeding three years.

New York and Maine.

New York vehicles get a safety inspection every 12 months, and most inspections also include an OBDII emissions check; to perform those OBDII emissions inspections, a DMV-certified inspector must additionally pass a computer-based exam on the CVIS, the state's computerized vehicle inspection system.

Cumberland County, Maine, layers an annual enhanced inspection — a gas-cap check for 1974-and-newer gasoline vehicles and an OBD check for 1996-and-newer models — onto station inspections, required since January 1, 1999.

The next section covers the opposite arrangement: programs where the state or its contractor runs the testing lanes and credentials its own people.

In these programs the vehicles come to lanes that the government or its contractor staffs, so the inspection credential belongs to the agency's or contractor's own employees.

A technician at an independent shop in these states is not the one performing the official test.

Illinois.

Illinois EPA oversees the program in the Chicago and Metro-East St. Louis areas under the Vehicle Emissions Inspection Law of 2005 (625 ILCS 5/13C), and the program is operated by Illinois EPA's contractor (Illinois Air Team) — so there is no private-garage emissions inspector license.

Delaware.

The Division of Motor Vehicles performs inspections itself at all four DMV facilities, for no fee, and the DMV says its inspection technicians are certified and trained.

Delaware does credential the repair side: emission repair technicians must be ASE L1 certified or hold a Department-approved equivalent, and the permit is valid for up to five years.

District of Columbia.

DC DMV inspects vehicles at a single station on Half Street SW, supplemented by two self-service OBD emissions kiosks; personal vehicle inspections are valid for 2 years, commercial and taxi/limo inspections for 1 year.

Maryland.

The Vehicle Emissions Inspection Program (VEIP) tests at MVA VEIP stations, where an attendant runs the test, or at self-service kiosks; most vehicles test every 2 years, and new vehicles first test 72 months after the model year.

It is not performed by licensed private-shop inspectors.

Indiana.

Indiana's Clean Air Car Check covers Lake and Porter counties and tests at seven program-run facilities (Crown Point, Gary, Griffith, Hammond, Hobart, Portage and Valparaiso).

The repair side has a voluntary credential: an Indiana Certified Emission Repair Technician (ICERT) completes a 60-hour emissions diagnosis and repair course and maintains ASE L1 certification — voluntary, not a license to work.

Oregon.

The Department of Environmental Quality runs testing itself at DEQ Clean Air Stations in the Portland and Medford areas, plus the DEQ Too self-service and internet options — not through licensed private-garage inspectors.

Wisconsin.

Emissions inspectors are employees of the state's emissions-testing contractor or its subcontracted inspection facilities, and the contractor licenses them after training and an exam — 80% on the written test plus a solo inspection demonstration.

Those contractor-issued licenses are valid for 2 years, with refresher training and testing required before renewal.

States with no program on EPA's list.

EPA keeps an alphabetical list of state and local I/M program websites, last updated September 18, 2026, and it has no entry for these states: Alabama, Alaska, Arkansas, Florida, Hawaii, Idaho, Iowa, Kansas, Kentucky, Oklahoma, South Carolina, South Dakota and Wyoming.

EPA does not list an active emissions-testing program for them, so there is no state emissions-inspector license to point technicians to.

Some of these states document the absence themselves.

Alabama's Department of Revenue states that 'Alabama law does not provide for emissions testing of motor vehicles,' so emissions testing is not a prerequisite to registration.

Alaska's Anchorage program was shifted from an active control measure to a contingency measure in the EPA approval effective February 9, 2012.

Idaho's legislature repealed the state requirement for I/M programs effective July 1, 2023, and EPA's approval removing the Boise-Northern Ada County program from the state plan took effect July 17, 2023, so the Treasure Valley no longer has emissions testing.

Kentucky's 2004 General Assembly (SJR 3) directed the cabinet to ask EPA to remove the Northern Kentucky Emissions Check program from the state plan; EPA approved moving the Boone, Campbell and Kenton County program into contingency measures effective November 3, 2005.

Washington's emission check fee section, RCW 70A.25.100, expired January 1, 2020, consistent with the end of the state's emissions testing program.

Tennessee followed a similar path.

EPA's 2021 rule removed the state's I/M program requirements for Davidson, Sumner, Rutherford, Williamson and Wilson counties and Hamilton County at the state's request.

The same rule notes that Tennessee Code Annotated 68-201-119(c) lets counties retain local I/M programs under certain conditions, so a local program can exist outside the state plan.

New Hampshire sits in its own category.

Its vehicle inspection statute, RSA 266:1, was repealed effective January 31, 2026.

Per the NH DMV's February 13, 2026 guidance, the inspection program is suspended until further notice: stations may not issue state inspection stickers, and vehicles do not need an annual state inspection.

In the centralized states, the emissions-related work that remains for independent shops is repair and diagnosis rather than official testing — which is where the inspector-versus-repair-technician split below becomes a career decision.

The programs differ in name and issuer, but the same steps recur: confirm the program, meet the baseline, complete the approved training, pass the program's written test, pass a practical demonstration where it sets one, and keep the certificate current.

The details below come from the program rules and agency pages themselves.

Watch two quirks.

First, the emissions credential sometimes rides on another license: North Carolina's emissions inspection mechanic must already hold the safety license, and Nevada's Class 2 requires meeting the Class 1 requirements within the last 12 months.

Second, some credentials name the equipment: Nevada Class 1 applicants show a certificate of competence from an approved exhaust gas analyzer manufacturer or demonstrate the equipment, and New York may require a skills test after the written one.

The same state can run two credentials on opposite sides of the test.

The inspector performs and certifies the inspection; the repair technician diagnoses and fixes the vehicle that failed.

The training, exams and renewal obligations can differ between them.

California is the cleanest example: the inspector license covers inspecting and certifying, the repair technician license covers diagnosing, adjusting and repairing, and neither covers the other's work.

Both cost $20 to apply and $20 to renew every 2 years, but the update training differs — 4 hours of BAR online training for inspectors versus 16 hours from a BAR-certified school for repair technicians.

Nevada builds the split into one ladder: Class 1 approved inspectors test, Class 2 approved inspectors test plus diagnose, repair and service emission controls.

Connecticut pairs the CTI with the Certified Emissions Repair Technician (CERT), who shows a current CERT number, ASE L1 training or factory training documents for the makes repaired; CERTs recertify every three years, and both credentials travel with the person across test centers.

New Jersey pairs the MVC Inspector License with the Emission Repair Technician (ERT): a registered Emission Repair Facility (ERF) must employ at least one ERT certified through the NJ DEP Emission Technician Education Program (ETEP).

Ohio certifies waiver repair technicians separately from inspectors.

They pass an Ohio EPA-sponsored or approved course and exam (the director may waive the course for current ASE L1) and hold current ASE A8 Engine Performance and A6 Electrical Systems certifications.

Certification is valid three years, and waiver repairs may be done only at a certified repair facility.

The state's rule defines an approved technician trainer as an ASE master technician with at least ten years of automotive-industry experience.

Pennsylvania defines a certified repair technician as someone who has proven completion of Department or nationally recognized emission-component repair training and holds an emissions repair technician certificate issued by the Department — a separate certificate from the inspector's card.

Virginia also certifies emissions repair technicians, for up to three years, extendable once by up to six months, while Colorado licenses emissions mechanics alongside emissions inspectors under the same statute.

Repair-side credentials also appear in the centralized-testing states and beyond.

Delaware requires ASE L1 or a Department-approved equivalent for its emission repair technicians, with permits valid up to five years.

Indiana's ICERT is voluntary and requires maintaining ASE L1.

Rhode Island recognizes Certified Inspection Repair Technicians (CIRTs) who already hold the Certified Inspection Technician credential plus ASE L1 or a pass of the RI CIRT exam — those passing the exam have two years to obtain L1.

Wisconsin designates WISETECH repair-technician training programs, a training designation rather than a required license, and Texas DPS still runs a Recognized Emission Repair Facility (RERF) program.

Notice how the same credential recurs on the repair side: ASE's L1 Advanced Engine Performance Specialist.

It is the qualifier in Delaware, the alternative to Nevada's Class 2 test, a qualifying option for Connecticut CERTs, a course waiver in Ohio and a CIRT route in Rhode Island.

The inspector side, by contrast, runs on each program's own training and tests.

Every program sets its own term and its own renewal mechanics, so set the calendar by the issuing agency rather than by habit.

The table collects the terms this page's facts state.

The shortest cycles on this page are the one-year renewals — Arizona's annual license, Salt Lake County's certificate, Albuquerque's Air Care certificate and Massachusetts's license — and the longest are Virginia's licenses, valid for up to three years.

Continuing education appears where states name it: California's four inspector hours and sixteen repair-technician hours, Nevada's Class 2 emissions-technology update, and North Carolina's four-hour refresher.

The quick reference below condenses the state sections above, from the same facts.

Confirm details with the agency before you enroll or test.

For the centralized programs — Delaware, the District of Columbia, Illinois, Indiana, Maryland, Oregon and Wisconsin — the state agency or its contractor staffs the testing lanes.

Wisconsin's contractor licenses its own inspectors for 2-year terms, with refresher training before renewal.

EPA's I/M website list, last updated September 18, 2026, shows no entry for Alabama, Alaska, Arkansas, Florida, Hawaii, Idaho, Iowa, Kansas, Kentucky, Oklahoma, South Carolina, South Dakota or Wyoming — so there is no state emissions-inspector license to earn there.

Tennessee's program requirements left the state plan under a 2021 EPA rule, though counties may retain local programs under state law.

Washington's fee section RCW 70A.25.100 expired January 1, 2020, consistent with the program's end.

New Hampshire repealed its inspection statute, RSA 266:1, effective January 31, 2026, and per DMV guidance from February 13, 2026 the program is suspended until further notice.

None of the programs on this page advertises cross-state transfer.

Connecticut notes that its CTI and CERT certifications travel with the person across test centers — but that portability is within Connecticut's own program, not between states.

If you move, plan on the new state's training and tests from the start.

When the credential lines up with where you want to work, the next step is a bay to use it in.

Open smog technician jobs are posted on the job board.

Career information, not licensing or legal advice. Program rules, fees and effective dates change; confirm current requirements with the state or local agency that runs your emissions program.