Kentucky Mobile Sources regulations & environmental compliance analysis

Kentucky Mobile Sources: What you need to know

Governing Law and Regulations

Employer trip reduction and commuting: 42 USC 7511a(d)(1)(B)

Regulatory Agency
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U.S. Environmental Protection Agency (EPA) Region 4

See ADDRESSES & CONTACTS for addresses and telephone numbers.

See national section for basic information and federal regulations.

Comparison: State vs. Federal

Rules. There are many mobile source regulatory requirements implemented nationally by EPA that impact mobile sources in Kentucky. The state had established a vehicle inspection and maintenance program in selected areas of the state, but those provisions were repealed.

Administration and enforcement. EPA implements and enforces federal mobile source requirements as they apply to sources in Kentucky.

State Requirements


42 USC 7511a(d)(1)(B)

The Clean Air Act Amendments of 1990 required states that have severe or extreme ozone nonattainment areas to revise their state implementation plan (SIP) by adopting new regulations to reduce work-related vehicle trips and miles traveled by employees. In 1995, Congress amended the law, allowing states to remove employer trip reduction (ETR) programs from the SIP, as long as those states maintain emissions reductions equivalent to those achieved with the ETR program. Kentucky has not implemented an ETR program.

Additional Guidance


For most people, the greatest polluting activity done on a daily basis is automobile usage. Mobile source exhaust contributes to ozone formation, smog, and toxic pollutants in the air. The following are tips to reduce vehicle emissions and save a little money:

  • Tune and maintain the vehicle. Your vehicle is designed to perform best when maintained according to the instructions ...

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Kentucky Mobile Sources Resources

Type Title
Forms Stage II System Decommissioning Notification Form
See all Mobile Sources Resources