Since 1984 most Marylanders have had their cars tested regularly for excessive emissions where diesel trucks and buses operating in and driving through Maryland have not had to be tested. It is only fair that everyone be involved in improving Maryland's air quality.
The owner of a Maryland-registered vehicle that fails a smoke test will be issued a Safety Equipment Repair Order (SERO). Owners must have that vehicle repaired and retested within 30 days of receiving a SERO or face having that vehicle's registration suspended.
A Certified Diesel Emissions Retester (CDER) is someone who is certified by the State to conduct retests and certify that the vehicle has been brought into compliance with the applicable smoke opacity standards. CDERs include certain Maryland State Police inspectors and diesel vehicle repair technicians located throughout the State.
Included are links to the Maryland State Police, Maryland's toll facilities, local and regional trucking organizations, and other sources of information.
Maryland's Diesel Emissions Vehicle Control Program Brochure
State Diesel Emissions Testing Programs
Smoking Vehicle Hotline1-866-677-2833Report a Smoking Vehicle On-Line
1800 Washington Boulevard, Baltimore, MD 21230