EPA Approved State Regulations
EPA approves those state regulations that have been formally submitted as State Implementation Plan (SIP) revisions and which the Agency determines meet the requirements of the Clean Air Act. It is possible that SIPs do not in all cases match current state regulations. This may occur, for example, when the state has modified a regulation in the federally approved SIP but has not submitted the changed regulation to EPA. Most states have their own regulations available on their Web sites, which you can consult if you wish to examine the current state regulations.
EPA has compiled tables with the approved state regulations which are federally enforceable. They were last updated November 2004.
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Due to the complexity of making SIPs available online, questions may arise on an approved section of the SIP that appears on the Web. Generally, when such questions arise, the Federal Register approval action and the CFR will serve as the final determination. While EPA has taken care with the accuracy of the files accessible here, they are not "official" rules in the sense that they can be used before a court of law. Due to translation between formats, and the variations in display by web browsers, errors (including human errors) can occur. Please notify us of any errors you encounter in the files.
Links to State Enforceable Regulations
The text of state enforceable regulations is available at the links provided below. In most cases, these regulations have been approved by EPA and are part of the SIP. Since these links are not maintained by EPA, we cannot ensure the accuracy of their content. As stated previously, state or local agencies are implementing some rules or versions of rules that may not be listed in EPA's tables of approved regulations. This occurs when there is a delay in rules and rule amendments being submitted for and/or approved by EPA.
In addition to the reasons stated previously, states may have rules pertaining to air pollution concerns that are typically not regulated by the federal government and consequently are not and will not be included in the federally approved SIP. Examples of this include odor and nuisance rules.