Mobile Sources

Mobile sources include a variety of motor vehicles and mobile equipment that generate air emissions, and that autonomously move or can be moved from place to place. The DNREC Mobile Sources Control Program implements measures and programs to reduce motor vehicle-related pollution from both on-road vehicles and non-road vehicles.

State Mobile Sources Programs

Reducing Diesel Emissions

Delaware has anti-idling rules and helps fund diesel emissions reduction projects as part of the National Clean Diesel Campaign.

Inspection and Maintenance

Delaware requires that vehicles changing ownership be inspected to make sure their emission control systems are in good working order.

VW Mitigation Plan

DNREC has developed a proposed mitigation plan to use Delaware’s share of the VW Environmental Mitigation Trust fund.

Clean Vehicles and Fuels

Delaware has several programs designed to reduce air emissions by promoting clean fuels and alternative vehicle use.

Contact Us

Valerie Gray
Division of Air Quality
On-Road Vehicles Non-Road Vehicles

Federal Rules and Regulations

Mobile Source Air Toxics Standard (see 40 CFR Part 80, Subpart J and Subpart L)

The Mobile Source Air Toxics Standard (MSATS) reduces hazardous air pollutants, also known as air toxics. Air toxics include benzene and other hydrocarbons such as 1,3-butadiene, formaldehyde, acetaldehyde, acrolein, and naphthalene. These are national requirements that require each refinery and importer to meet specific compliance baselines for conventional and reformulated gasoline.

Reformulated Gasoline (see 40 CFR Part 80, Subpart D)

Reformulated Gasoline (RFG) was mandated by Section 211(k) of the federal Clean Air Act (CAA) for metropolitan areas with the worst smog beginning in 1995. This includes New Castle and Kent County Delaware; and Sussex County which was opted in by the Governor in 1993. RFG is blended to burn more cleanly than conventional gasoline, reducing emissions of ozone-forming and toxic pollutants. About 30 percent of the gasoline sold in the U.S. is subject to RFG requirements.

Reid Vapor Pressure (see 40 CFR Part 80, Subpart B (80.27))

Reid Vapor Pressure (RVP) requirements are designed to reduce the volatility of commercial gasoline during the summer ozone control season, and apply nationwide. Summertime (i.e., June 1 to Sept. 15) RVP is 9.0 in all attainment areas, 9.0 in northern nonattainment areas (including Delaware and to the north) and 7.8 in southern nonattainment areas. Note that although these RVP requirements apply to both RFG and conventional gasoline, the volatile organic compound (VOC) emissions performance standards in RFG effectively require lower RVP levels.

Renewable Fuels Standard (see 40 CFR Part 80, Subpart M)

The Renewable Fuels Standard (RFS) requires that transportation fuel sold in the U.S. contain a minimum volume of renewable fuel. The RFS applies to any refiner or importer of gasoline within the 48 contiguous states. Refiners have substantially met the RFS requirements to date by adding 10 percent ethanol to gasoline.

Related Links

Delaware Department of Transportation

Federal Highway Administration

Department of Energy — Vehicles

US Energy Information Administration — Renewable and Alternative Fuels

US Department of Transportation — Air Quality

US Environmental Protection Agency — Transportation and Air Quality

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