This website is designed to answer your questions about the Massachusetts motor vehicle emissions and safety inspection program, which plays an important role in reducing air pollution and keeping our roads safe. Massachusetts Vehicle Check is a joint program of the Department of Environmental Protection (MassDEP) and the Registry of Motor Vehicles (RMV).




Learn about vehicle safety inspections and emissions testing, find answers to frequently asked questions and access helpful resources and tools.

Stations and Inspectors


Get the latest program information, learn about licensing, training and certification exams and find useful resources.

Repair Industry


Become a Registered Repair Facility or Technician, access the Repair Data Entry tool, take the MASS module exam, participate in a Repair Forum.