Diesel inspections emission testing

What inspection and emissions testing are required for diesel vehicles?

A non-exempt diesel-powered motor vehicle may be subject to either the OBDII emissions inspection or the diesel emissions inspection. Additional information about these inspections may be found on the table below.

Emissions Inspections for Diesel-powered Vehicles

WhatOBDII Emissions InspectionDiesel Emissions Inspection
Vehicles Subject to InspectionAll model year 1997 or newer non-exempt diesel-powered motor vehicles under 8,501 lbs. GVWR 1 All non-exempt diesel-powered motor vehicles over 8,500 pounds MGW 2 registered in the NYMA 3 
Station ClassOfficial Emissions Inspection StationDiesel Emissions Inspection Station
Equipment TypeCVIS (computerized vehicle inspection system)Diesel emissions inspection system (smokemeter)
Sticker TypeSafety/Emissions Inspection CertificateSafety/Diesel Emissions Inspection Certificate


Which vehicles are subject to the diesel emissions inspection?

All non-exempt diesel-powered vehicles registered in the NYMA or Diesel Emissions Metropolitan Area (DEMA) (some registrations may or may not show they are within DEMA), with a maximum gross weight (MGW), as indicated on the vehicle registration certificate, over 8,500 pounds, must get an annual diesel emissions inspection. The diesel emissions inspection must occur at the same time as the annual safety inspection. The DEMA includes the five boroughs of New York City, and Nassau County, Suffolk County, Rockland County, and Westchester County. The model year does not exempt a vehicle from the inspection. Read section 79.2(h) of the inspection regulations to get information about vehicles that are exempt.

All diesel-powered vehicles registered outside of the Diesel Emissions Metropolitan Area (DEMA), with a maximum gross weight (MGW) over 8,500 pounds, do not require an annual diesel emissions inspection, but may be subject to a random roadside diesel emissions inspection.

All model year 1997 or newer non-exempt diesel-powered vehicles, registered anywhere in New York State, with a gross vehicle weight rating (GVWR) less than 8,501 pounds, must get an annual OBDII emissions inspection, and are not subject to the diesel emissions inspection.

All model year 1996 or older diesel-powered vehicles, registered anywhere in New York State, with a gross vehicle weight rating (GVWR) less than 8,501 pounds, are not subject to the OBDII emissions inspection, the low-enhanced emissions inspection, or the diesel emissions inspection.


Is the Diesel Opacity Emissions inspection required in other areas of New York State, or for vehicles registered in other states?

No, but the NYS Department of Environmental Conservation, the NYS Department of Transportation, or the NYS Police can test any diesel-powered vehicle that has a MGW of more than 8,500 lbs. at any roadside inspection site that is located on any New York State highway. If a vehicle fails the roadside inspection, a traffic ticket can be issued.


Does the diesel emissions inspection only apply to large trucks and buses?

No. The program includes all diesel-powered vehicles that are registered in the Diesel Emissions Metropolitan Area (DEMA) and that have a MGW, as indicated on the vehicle registration, greater than 8,500 lbs. The program includes some pick-up trucks and some medium-duty trucks. Read section 79.26 of the DMV Commissioners Regulations “Vehicles subject to diesel emissions inspection”.


What is a Temporary Certificate of Emissions Waiver (VS-1078)?

When an existing diesel emissions inspection certificate expires while the vehicle is outside the DEMA, that resident may apply to the Department of Motor Vehicles for a 'Temporary Certificate Emissions Waiver' (VS-1078). Temporary Certificate Emissions Waiver is only available at DMV Issuing Offices. The temporary emissions waiver certificate when displayed on the vehicle along with a valid New York Safety Inspection Certificate will allow the vehicle to be operated while the vehicle is outside the DEMA. The Temporary Certificate of Emissions Waiver will be valid for ten (10) days from the date that the vehicle returns to the NYMA. Read regulation 79.1(r) of the NYS DMV Motor Vehicle Inspection Regulations (CR-79).


When does the diesel emissions inspection occur?

The diesel emissions inspection occurs at the time of the annual safety inspection.


Where are the diesel emissions inspections conducted?

The diesel emissions inspection is conducted at a diesel emissions inspection station.


Can an inspection station in the New York Metropolitan Area (NYMA) that is not a diesel emissions inspection station conduct other inspections?

The station can conduct other inspections. The station cannot inspect vehicles that are subject to the diesel emissions inspection.


What is the fee for a diesel emissions inspection?

You can refer to Inspection Groups and Fee Chart (VS-77) for this information.


How does an inspection station become a diesel emissions inspection station?

The station must purchase a DMV-approved smokemeter (find a vendor). A station can conduct an emissions inspection on a diesel-powered vehicle if the station is licensed to conduct a safety inspection for that specific type of vehicle. To prove that an approved smokemeter was purchased, the station must send a photocopy of the invoice to this address

NYS DMV Bureau of Consumer & Facility Services
Application Unit
P.O. Box 2700
Albany, NY  12220-0700

If you have questions, call 1-518-474-0919.

  • 1. gross vehicle weight rating
  • 2. maximum gross weight
  • 3. NYMA - New York Metropolitan Area
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