Code of Maryland Regulations (COMAR)
- 2007 Heavy Duty Highway Diesel Rule
Beginning with the 2007 model year, harmful pollution from heavy-duty highway vehicles will be reduced by more than 90 percent. The sulfur concentration in highway diesel fuel must be no higher than 15 parts per million (ULSD) to enable the use of advanced pollution controls.
- Clean Air Non-Road Diesel Engine & Fuel Rule
Non-road engine and fuel controls are integrated as a system to gain the greatest emission reductions; new non-road engines will have advanced emission-control technologies similar to those already used for highway trucks and buses. This rule requires non-road diesel fuel to have a sulfur concentration no higher than 500 parts per million in 2007, and no more than 15 parts per million (ULSD) by 2010.
- Direct Final Rule and Amendments to the Highway and Non-Road Diesel Rules (July 2005, November 2005, and April 2006)
EPA amended the Highway Diesel and Non-Road Diesel rules to provide a temporary increase in the sulfur testing tolerance and to allow the use of biodiesel to ensure compliance with the diesel fuel regulations.
- Clean Diesel Program for Locomotives and Marine Engines
Information about EPA’s plan to propose more stringent emission standards and other provisions for new and existing locomotives and new marine diesel engines.
Smoking Vehicle Hotline
Report a Smoking Vehicle On-line