Mobile Sources - DNREC
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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.
Pamela Keeney
Division of Air Quality
302-739-9402
On-Road Vehicles
Non-Road Vehicles
Fuel Rules and Regulations
The U.S. Environmental Protection Agency (EPA) regulates fuels and fuel additives used in both on-road and non-road motor vehicles and engines. These regulations are intended to prevent air and water pollution that could endanger public health and the environment. The EPA also regulates emission byproducts and fuel additives that may interfere with vehicles or engine emission control systems designed to reduce harmful emissions. (
Federal Gasoline Regulations | US EPA
In addition to federal regulations, the State of Delaware requires that all fuel sold within the state meet or exceed American Society for Testing and Material (ATSM) specifications, as codified in
Delaware Code, Title 6, Chapter 29, §2913 (c)(1)
. These requirements are administered by the Delaware Department of Agriculture, Office of Weights and Measures. This rule is intended to protect the motoring public from fuel-related performance issues and ensure fuel quality consistency.
Federal Gasoline regulations are found under
40 CFR Part 1090
, “Regulation of Fuels, Fuel Additives, and Regulated Blendstocks” and
40 CFR part 80, subpart M
, “Renewable Fuel Standard.”
Federal Fuel Programs
Mobile Source Air Toxics Standard (see
40 CFR § 1090.210
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. (
Gasoline Mobile Source Air Toxics | US EPA
Reformulated Gasoline (see
40 CFR § 1090.220
and
40 CFR § 1090.285
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. (
Reformulated Gasoline | US EPA
Reid Vapor Pressure (see
40 CFR § 1090.215
Reid Vapor Pressure (RVP) requirements are designed to reduce the volatility of commercial gasoline during the summer ozone control season. Under Clean Air Act section 211(h), summer gasoline (e.g., gasoline that is sold to consumers from May 1 to September 15) must meet a maximum per-gallon RVP limit of 9.0 psi unless it is required to meet a lower RVP limit. Lower RVP limits apply in areas that are required to sell federal reformulated gasoline; therefore, Delaware has a lower RVP limit of 7.4 PSI. (
Gasoline Reid Vapor Pressure | US EPA
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. (
Overview of the Renewable Fuel Standard Program | US EPA
Note:
EPA gasoline regulations were reorganized from 40 CFR Part 80 to 40 CFR Part 1090 in 2021 apart from the RFS regulations. References have been updated accordingly.
Related Links
Delaware Department of Transportation
Federal Highway Administration
FuelEconomy.gov
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
Metropolitan Planning Organizations (MPOs)
Delaware Valley Regional Planning Commission
WILMAPCO
Dover/Kent County MPO
Salisbury/Wicomico MPO
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clean air
emissions
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On-road vehicles include:
Passenger vehicles such as sedans
Light-duty trucks such as minivans, pickup trucks and SUVs
Heavy-duty vehicles such as commercial trucks and buses
Medium-duty passenger vehicles such as passenger or cargo vans
Motorcycles
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Non-road vehicles include:
Recreational vehicles such as (gasoline-powered) dune buggies, moto-cross motorcycles, or golf carts
Construction equipment and vehicles such as paving equipment, excavators, or earth movers.
Industrial equipment such as forklifts, sweepers or material handling motor vehicles
Lawn and garden equipment
Farm equipment
Logging equipment (for example, chainsaws or winches)
Airport service equipment and vehicles
Railway maintenance equipment
Aircraft
Marine vessels
Locomotives
Note:
Permits may be required for any equipment where the emission source is not used to move the equipment during operation, as required per 7 DE Admin. Code 1102.
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