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This page last reviewed February 22, 2008
What's under the hood is important to air quality.
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| Automotive emissions account for over 50 percent of all smog-forming pollutants
in California. To improve air quality, the California Air Resources Board (ARB) requires vehicle manufacturers
to develop engine and emission equipment systems that reduce the specific pollutants that cause California's
severe air quality problem. These emission control systems are also required to be proven durable and reliable. |
| To ensure that these systems operate as designed, California Vehicle Code
Section 27156 and the Federal Clean Air Act prohibit modifications that increase motor vehicle emissions. Since
if properly designed, most performance modifications do not increase vehicle emissions, these same laws
also allow the installation of parts or modifications proven by their manufacturers and the ARB not to increase
vehicle emissions. |
| Aftermarket Parts Related Programs Include: |
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All aftermarket parts sold in California belong to one of the
following three groups:
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| Replacement Parts |
| Replacement Parts Guide |
| Legal Add-On or Modified Parts (Executive Order Parts) |
| Aftermarket
Parts Database |
| Competition or Racing Use Only Parts |
| Information About Uncontrolled Vehicles |
| Additional Information for Manufacturers of Aftermarket
Parts |
| An exemption from Vehicle Code Section 27156 (VC 27156), California's anti-tampering
law, is required before any add-on or modified part can be sold in California. Manufacturers interested in obtaining
a VC 27156 exemption for an add-on or a modified part should fill-out and submit an application form to the ARB
for evaluation. Detailed information on how to do this can be obtained from the document, "Procedures for
Exemption of Add-On and Modified Parts," amended June 1, 1990. (PDF - 2.54M) |
| Heavy-Duty Diesel Retrofit Device Emission Reduction Verification |
| Recently, the Air Resources Board initiated a number of incentive programs
to offer funds for retrofitting existing heavy-duty engines in public and private fleets to reduce PM and
NOx emissions. Retrofit systems to be used in any PM or NOx incentive program must be evaluated and certified
for their emission reducing capabilities. Applicants who plan to participate in any of the ARB's
retrofit programs may obtain additional information by viewing the ARB's Diesel Mobile Programs website at http://www.arb.ca.gov/diesel/mobile.htm |
| Who can I contact for more information? |
| For more information, please contact Rose Castro at (626) 575-6848 or via
e-mail at rcastro@arb.ca.gov. |
Mobile Source Program
ARB Permits, Certifications, Exemptions,
and Registrations
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