# New York — Vehicle emissions testing: which counties require it, in which states

For New York, counties where testing is required is diesel vehicles registered within the Diesel Emissions Metropolitan Area (DEMA) - New York City, Nassau County, Suffolk County, Rockland County, and Westchester County; how often is must get an annual diesel emissions inspection, verified against its source on 2026-08-19.

- **State:** New York _(our reading, not quoted from the source)_
- **Counties where testing is required:** diesel vehicles registered within the Diesel Emissions Metropolitan Area (DEMA) - New York City, Nassau County, Suffolk County, Rockland County, and Westchester County _(verified: appears in the quote below)_
- **How often:** must get an annual diesel emissions inspection _(verified: appears in the quote below)_
- **Vehicles covered / exempt:** All non-exempt diesel-powered motor vehicles with a model year greater than the current year minus 25 and less than or equal to the current year minus two, registered anywhere in New York State, with a gross vehicle weight rating (GVWR) less than 8,501 pounds _(also on this page, in the second passage quoted below)_

## What the source says

> There are different requirements for diesel vehicles registered within the Diesel Emissions Metropolitan Area (DEMA) - New York City, Nassau County, Suffolk County, Rockland County, and Westchester County outside DEMA Diesel Vehicles Registered Within DEMA All non-exempt diesel-powered vehicles 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 same source also states

> All non-exempt diesel-powered motor vehicles with a model year greater than the current year minus 25 and less than or equal to the current year minus two, 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. For Example, in 2023 the model year vehicles subject to OBDII inspections are 1999 through 2021.

Source: https://dmvsearch.webnycdn.ny.gov/node/5906

## Source

- https://dmvsearch.webnycdn.ny.gov/node/5906

Last verified: 2026-08-19. Review by: 2027-08-19.
Part of [Vehicle emissions testing: which counties require it, in which states](https://referencesource.org/vehicle-emissions-testing-by-state/).