California has introduced new tire regulations targeting microplastic pollution from tire wear. The rules, part of a broader environmental initiative, require tire manufacturers to reduce the emission of 6PPD, a chemical used to prevent tire degradation, which is toxic to aquatic life. The regulations were adopted by the California Air Resources Board (CARB) in 2023 and are being phased in over several years.
For automotive enthusiasts, the regulations could impact the availability of certain aftermarket tires, particularly those designed for high-performance or off-road use. These tires often contain higher levels of 6PPD or other compounds that may not meet the new standards. However, as of June 2026, no specific aftermarket tires have been banned, and manufacturers are working on compliant alternatives.
The regulations also require tire retailers to provide information to consumers about the environmental impact of tire choices. This could lead to higher costs for some specialty tires, as manufacturers invest in new formulations. Enthusiasts are advised to check for compliant tires when purchasing replacements for modified vehicles.
Environmental groups support the regulations, citing studies that show tire wear particles are a major source of microplastic pollution in waterways. The California Department of Toxic Substances Control has estimated that tire wear contributes up to 10% of microplastics in the state's waters.
