Iowa Mobile Sources regulations & environmental compliance analysis

Iowa 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 7

Iowa Department of Natural Resources (DNR)

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 Iowa. See the national section MOBILE SOURCES for more information.

Administration and enforcement. EPA administers and enforces the mobile source requirements that impact air quality in Iowa.

State Requirements


The Clean Air Act Amendments of 1990 required states that have severe or extreme ozone nonattainment areas to revise their state implementation plans (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 the state can maintain emissions reductions equivalent to those achieved with the ETR program. Iowa does not have any severe or extreme nonattainment areas for ozone and has not implemented an ETR program.

Additional Guidance


For most Iowans, the greatest polluting activity done on a daily basis is automobile usage. Mobile source exhaust contributes to ozone formation and smog, as well as accounting for nearly 50 percent of toxic chemicals in Iowa's air. DNR offers the following tips to reduce vehicle emissions and save a little money:

  • Tune and maintain the vehicle. Visible smoke from a ...

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