Program endedSources checked Oct 7, 2026
Does Idaho require emissions testing?
Idaho no longer requires vehicle emissions testing. The Legislature repealed the state requirement for inspection and maintenance programs effective July 1, 2023, and the EPA approved removing the Ada County program in 2023.
Program changes
In 2022 the Idaho Legislature repealed the state requirement for vehicle emissions testing programs, effective July 1, 2023.
“In 2022, the Idaho Legislature passed a law to repeal the state requirement for vehicle I/M programs (e.g., emissions testing), effective July 1, 2023.”
The Treasure Valley programs were found to be less effective than before, because of vehicle turnover and stricter federal standards.
“However, modeling results show I/M programs are not as effective as they once were due to vehicle turnover and new, stricter federal motor vehicle emissions standards.”
Idaho emissions testing questions
Does Idaho require emissions testing?
No. Idaho no longer requires vehicle emissions testing.
Sources
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- Idaho Department of Environmental Quality: Vehicle emissions · checked Oct 7, 2026