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Please note: This summary is provided to help you understand the regulations. Consult the references provided for links to the full text of the regulations.
Transportation Modes » Road » Engine Emissions
| Applies to: |
Anyone who owns or operates a Diesel powered vehicle that uses a Selective Catalytic Reduction (SCR) system to meet federal engine emissions standards. |
| Requires: |
No additional requirements beyond those applying to engine maintenance and rebuilding -- article provides background and best practices information. |
| See also: |
Clean Air Act
Engine Tampering |
| Applies to: |
Applies directly to vehicle and engine manufacturers and the refining industry, who are required to produce cleaner running engines and diesel fuel. Applies indirectly to the transportation sector by affecting the cost and availability of fuel. |
| Requires: |
Heavy-duty engines must meet emissions standards for particulates (soot) and ozone precursors (nitrogen oxides and hydrocarbons). Diesel fuel must meet limits on sulfur content. |
| See also: |
Clean Air Act
National Clean Diesel Campaign (exit TERC) |
| Applies to: |
All trucks operating in or passing through an area where state or local idling ordinances are in force. (There are no federal regulations limiting truck idling. However, more than half of U.S. states and dozens of cities and counties have enacted idling laws or ordinances.) |
| Requires: |
Most frequently, idling laws limit the amount of time, in minutes, that a truck and operate its engine while not moving. Many exemptions apply, which can vary widely among locations and states. |
| See also: |
Fuel Efficiency
Greenhouse Gas Emissions
SmartWay Program (exit TERC)
Engine Emissions (Truck, Tailpipe) |
| Applies to: |
The standards apply directly to engine and equipment manufacturers, rather than owners and operators. In some cases, owners may be required to register their equipment, and to keep records available for inspection. |
| Requires: |
The standards limit the allowable level of emissions from a wide variety of non-vehicle engines sold in the United States. Some types of engines, such as forklift trucks and transport refrigeration units, are used widely in the transportation sector. |
| See also: |
Clean Air Act
Greenhouse Gas Emissions
Engine Emissions (Truck, Idling)
Engine Emissions (Truck, Tailpipe) |
| Applies to: |
Manufacturers or importers of new heavy-duty vehicles or engines intended for highway use; also applies to anyone who converts heavy-duty vehicles or engines used in highway vehicles to run on alternative fuels |
| Requires: |
Manufacturers must install systems that monitor the functioning of the vehicle or engine emission control system, and that alerts the operator if corrective action is needed |
| See also: |
Idling emissions
Tailpipe emissions |
| Applies to: |
Emissions standards for new vehicles apply to manufacturers and importers. In many locations, inspection and maintenance regulations, and some operating restrictions, apply to vehicle owners and operators. |
| Requires: |
New vehicles must emit levels of several hazardous pollutants below specified thresholds tested over standard driving cycles. Existing vehicles registered or operating in specified locations must be inspected periodically. Some states have instituted roadside monitoring programs to detect and test for smoke opacity. Idling restrictions apply in some locations.
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| See also: |
Diesel Fuel Requirements (Truck)
Engine Emissions (Truck, Idling)
Greenhouse Gas Emissions
National Clean Diesel Campaign (exit TERC)
SmartWay Program (exit TERC) |
| Applies to: |
EPA's National Clean Diesel Campaign (NCDC) promotes clean air strategies by working with manufacturers, fleet operators, air quality professionals, environmental and community organizations, and state and local officials to reduce diesel emissions
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| Requires: |
Recent diesel rulemakings have focused on light- and heavy-duty highway vehicles, nonroad diesel equipment, locomotive and marine engines, and large ocean-going vessels
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| See also: |
SmartWay Program (exit TERC) |
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