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

For Massachusetts, vehicles covered / exempt is all motor vehicles registered in Massachusetts; 2. any motor vehicle owned or operated by a federal agency in Massachusetts (regardless of whether such vehicles are registered in Massachusetts); and 3. diesel vehicles with a GVWR greater than 10,000 pounds operating on Commonwealth roads but not registered in Massachusetts; program / authority is Emissions Inspections, verified against its source on 2026-08-24.

- **State:** Massachusetts _(our reading, not quoted from the source)_
- **Vehicles covered / exempt:** all motor vehicles registered in Massachusetts; 2. any motor vehicle owned or operated by a federal agency in Massachusetts (regardless of whether such vehicles are registered in Massachusetts); and 3. diesel vehicles with a GVWR greater than 10,000 pounds operating on Commonwealth roads but not registered in Massachusetts. _(verified: appears in the quote below)_
- **Program / authority:** Emissions Inspections

## What the source says

> 1. all motor vehicles registered in Massachusetts; 2. any motor vehicle owned or operated by a federal agency in Massachusetts (regardless of whether such vehicles are registered in Massachusetts); and 3. diesel vehicles with a GVWR greater than 10,000 pounds operating on Commonwealth roads but not registered in Massachusetts.

## The same source also states

> (b) The following motor vehicles are exempt from the emissions inspection: 1. any diesel vehicle with a model year earlier than 1984; 2. any light duty diesel vehicle with a model year earlier than 1997 or 15 or more model years old; 3. any medium duty diesel vehicle with a GVWR of not more than 10,000 pounds and with a model year earlier than 2007 or 15 or more model years old; 4. any light duty nondiesel vehicle with a model year earlier than 1996 or 15 or more model years old; 5. any medium duty nondiesel vehicle with a model year earlier than 2008 or 15 or more model years old; 6. any heavy duty nondiesel vehicle not equipped with an OBD system or 15 or more model years old;

Source: https://www.law.cornell.edu/regulations/massachusetts/310-CMR-60-02

## Source

- https://www.law.cornell.edu/regulations/massachusetts/310-CMR-60-02

Last verified: 2026-08-24. Review by: 2027-08-24.
Part of [Vehicle emissions testing: which counties require it, in which states](https://referencesource.org/vehicle-emissions-testing-by-state/).