
The Environmental Protection Agency (EPA) enforces stringent emission standards for highway motorcycles, which have been developed and refined for over thirty years. The EPA has regulations for smog, soot, and other air pollution from non-electric motorcycles, and also provides certification for electric motorcycles. The Clean Air Act, which calls for the EPA to consider the need to achieve equivalent emission reductions from motorcycles and other vehicles, specifies that the term motor vehicle applies to vehicles designed for transporting people or property on a street or highway. The EPA has also set forth three criteria that, if met, would cause a vehicle not to be considered a motor vehicle and therefore not subject to motor vehicle requirements.
| Characteristics | Values |
|---|---|
| Emission standards | The EPA has stringent emission standards for highway motorcycles that have been developed and refined for over thirty years. |
| Clean Air Act | Motorcycles are regulated under section 202 of the Clean Air Act, which calls for the EPA to consider the need to achieve equivalent emission reductions from motorcycles and other vehicles as much as possible. |
| Noise emission control | The EPA has noise emission labeling standards, and some states, like California and Maine, have laws requiring motorcycles to display an EPA noise emission control label. |
| Electric motorcycle certification | The EPA provides certification for electric motorcycles, and manufacturers must register with the EPA and follow specific steps to gain access to EV-CIS for certification. |
| Exhaust emission standards | The EPA has adopted revised exhaust emission standards for currently regulated highway motorcycles and new standards for smaller motorcycles and all classes of highway motorcycles. |
| Air pollution | The EPA regulates air pollution from non-electric motorcycles, including smog, soot, and other types of pollution impacting human health and welfare. |
| Fuel cost savings | The EPA estimates that fuel cost savings associated with emission regulations will offset about one-fourth of the program's cost by 2030. |
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What You'll Learn
- The EPA enforces stringent emission standards for highway motorcycles
- California's sticker law makes it illegal to park, use, or operate a motorcycle without an EPA noise emission control label
- The Clean Air Act includes motorcycles in its definition of a motor vehicle
- The EPA has adopted new exhaust emissions standards for smaller motorcycles
- Electric motorcycles must be certified by the EPA

The EPA enforces stringent emission standards for highway motorcycles
The Environmental Protection Agency (EPA) enforces stringent emission standards for highway motorcycles. The EPA has been developing and refining these standards for over thirty years. The Clean Air Act, specifically section 202, calls for the EPA to strive for equivalent emission reductions from motorcycles and other vehicles.
The EPA's regulations for highway motorcycle emissions are focused on reducing smog, soot, and other forms of air pollution from non-electric motorcycles. These standards are in place because highway motorcycles contribute to ozone and particulate matter (PM) nonattainment, as well as other types of pollution that impact human health and welfare. The EPA has also adopted new permeation evaporative emission standards for all classes of highway motorcycles.
In addition to emission standards, the EPA also regulates motorcycle noise. For example, California has introduced a "sticker law," which makes it illegal to park, use, or operate a motorcycle manufactured after a certain date without an EPA noise emission control label. This law simplifies compliance determination for law enforcement officers and helps reduce excessive noise from motorcycles.
Motorcycle manufacturers must adhere to the EPA's stringent emission standards and provide the necessary certification and supporting materials for each model year. The EPA's regulations aim to balance environmental protection, performance, and safety while also considering the potential fuel cost savings associated with these regulations.
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California's sticker law makes it illegal to park, use, or operate a motorcycle without an EPA noise emission control label
California has strict laws regarding motorcycle emissions and noise. The California Air Resources Board (CARB) regulates Off-Highway Recreational Vehicles (OHRVs), including dirt bikes, to reduce their impact on air quality. CARB introduced the "green sticker" program, allowing off-road vehicles that meet emission standards to operate on public lands. However, due to the majority of motorcycle manufacturers not being able to meet the emission standards, they petitioned for an exception, and CARB instated the "red sticker" program as an extension.
California's sticker law makes it illegal to park, use, or operate a motorcycle manufactured after January 1, 2013, or a motorcycle with an aftermarket exhaust system manufactured after that date, without a U.S. Environmental Protection Agency (EPA) noise emission control label. This law simplifies enforcement by providing a simple, objective way to determine compliance with noise emissions regulations. The EPA label serves as a readily visible indication of whether a motorcycle has been tampered with, eliminating the need for specialized mechanical knowledge to establish evidence of illegal tampering.
The legislation imposes fines of between $50 and $100 for a first offense, and between $100 and $250 for subsequent offenses. It is important to note that the offense is considered a secondary infraction, meaning a police officer cannot stop a motorcyclist solely on the suspicion of violating the labeling requirement. Additionally, the law allows a court to dismiss a penalty for a first offense if the offender can show they have corrected the violation.
California law generally requires all new vehicles, including motorcycles, to have labeling indicating compliance with required emission standards. This is known as the Vehicle Emissions Information label, and it must be located in a clearly visible position on the vehicle. The label lists the equipment used to comply with California requirements and the vehicle's test group or Engine Family Number, which can be cross-referenced on the ARB website.
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The Clean Air Act includes motorcycles in its definition of a motor vehicle
The EPA has developed stringent emission standards for highway motorcycles, aiming to reduce air pollution from non-electric motorcycles, such as smog and soot. These regulations ensure that motorcycle manufacturers comply with specific emission standards, contributing to the improvement of air quality and the protection of human health and welfare.
In addition to emission standards, the EPA also addresses motorcycle noise pollution. California and Maine, for instance, have implemented legislation requiring motorcycles to have an EPA noise emission control label, also known as a sticker law. This law simplifies enforcement by allowing law enforcement officers to visually determine a motorcycle's compliance with noise emission standards. Offenders of this law are subject to fines, with amounts varying depending on the number of offenses.
Furthermore, the EPA has established certification processes for electric motorcycles, outlining the steps manufacturers must take to gain certification for their vehicles. This includes registering with the EPA, setting up accounts, and providing the necessary certification datasets and supporting materials.
The EPA's enforcement of laws and regulations on motorcycle emissions and noise pollution is an important aspect of maintaining environmental quality and ensuring the safe and practical use of motorcycles on streets and highways.
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The EPA has adopted new exhaust emissions standards for smaller motorcycles
The Environmental Protection Agency (EPA) has been regulating emissions from highway motorcycles for over thirty years. In 2004, the EPA adopted new exhaust emissions standards for smaller motorcycles, specifically those with an engine capacity of less than 50 cubic centimeters. This was the first time that such motorcycles were subject to EPA regulations. The EPA also adopted revised exhaust emission standards for larger, already-regulated highway motorcycles, as well as new permeation evaporative emission standards for all classes of highway motorcycles.
The EPA's regulations for highway motorcycles are developed under the Clean Air Act, which calls for the EPA to strive for equivalent emission reductions from motorcycles and other vehicles. The EPA's actions are motivated by the health and welfare effects of ground-level ozone and its precursors, which are produced by highway motorcycle emissions. Highway motorcycles contribute to ozone and particulate matter (PM) nonattainment, as well as other types of pollution that impact human health and welfare.
The EPA expects that manufacturers will be able to meet these new standards without compromising the performance or safety of their products. In fact, the EPA estimates that the fuel cost savings associated with these regulations will offset about one-fourth of the program's cost by the time the standards are fully phased in (2030).
In addition to emissions standards, the EPA also enforces noise emission control regulations for motorcycles. For example, California legislation has made it illegal to park, use, or operate a motorcycle manufactured after January 1, 2013, or with a specific type of after-market exhaust system, without an EPA noise emission control label ("sticker law"). Maine has enacted similar laws, and other states such as Connecticut have set maximum noise levels for motorcycles. These laws are enforced by local law enforcement agencies and aim to reduce unnecessary or excessive noise from motorcycle engines.
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Electric motorcycles must be certified by the EPA
The Environmental Protection Agency (EPA) enforces stringent emission standards for highway motorcycles under the Clean Air Act. These standards have been developed and refined over thirty years. The EPA also regulates non-electric motorcycles, with specific regulations for smog, soot, and other types of air pollution.
In addition to emission standards, the EPA has adopted new permeation evaporative emission standards for all classes of highway motorcycles. These regulations aim to reduce the impact of motorcycles on ozone and particulate matter (PM) nonattainment, as well as other types of pollution that affect human health and welfare.
To ensure compliance with these standards, the EPA requires electric motorcycles to be certified. The certification process involves registering with the EPA to gain access to the EV-CIS system and obtaining a specific manufacturer code for the desired certification. Users must set up an account and establish the necessary EV-CIS roles to update and view information.
For each model year of an Engine Family, manufacturers must provide the applicable certification dataset and supporting materials, including system documentation and a certification template. A CROMERR signer must submit an RFC for each Engine Family, and the certificate will be received in the CDX inbox. These steps ensure that electric motorcycles meet the necessary emission standards and contribute to improving air quality and human health.
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Frequently asked questions
The EPA enforces stringent emission standards for highway motorcycles under section 202 of the Clean Air Act. The EPA also enforces regulations for smog, soot, and other air pollution from non-electric motorcycles.
The EPA has adopted revised exhaust emission standards for currently regulated highway motorcycles. They have also set new exhaust emissions standards for motorcycles with less than 50 cubic centimeters in displacement. Additionally, the EPA has implemented new permeation evaporative emission standards for all classes of highway motorcycles.
The EPA has been working with various working groups, including local law enforcement and citizen groups, to investigate and research specific industry sound testing standards. The EPA is also considering the feasibility of incorporating noise emission labeling standards into state law. For example, California has approved legislation making it illegal to operate a motorcycle without an EPA noise emission control label, also known as a "sticker law."
The EPA enforces the laws on motorcycle emissions through certification and compliance requirements. Manufacturers must register with the EPA and provide certification datasets and supporting materials for each model year. The EPA also charges a fee for each certificate issued.

























