Certification and Compliance for Vehicles and Engines
Onroad
(Includes motorcycles, passenger
cars and trucks, commercial trucks,
and buses)
cars and trucks, commercial trucks,
and buses)
Nonroad
(Includes aircraft, heavy equipment, locomotives, marine vessels, recreation vehicles, and small equipment and tools)
EV-CIS
Engines and Vehicles Compliance Information System (EV-CIS), formerly the Verify System (for onroad and nonroad vehicles and engines)
Guidance Letters
Learn more about guidance letters, including how to find them by year issued and how to get notified when new letters are issued.
Search for Documents
Search EPA's Transportation and Air Quality
database for documents:
database for documents:
In the DIS, you can find:
- Advisory circulars
- Applications for certification
- Certificates of conformity
- Certificate summary information reports
- Manufacturer guidance letters
- EV-CIS (formerly Verify) documentation