# Idaho — Vehicle emissions testing: which counties require it, in which states

For Idaho, recent or pending change is 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; program / authority is Inspection and Maintenance (I/M) p rograms, verified against its source on 2026-08-24.

- **State:** Idaho _(our reading, not quoted from the source)_
- **Recent or pending change:** 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. _(verified: appears in the quote below)_
- **Program / authority:** Inspection and Maintenance (I/M) p rograms _(verified: appears in the quote below)_

## What the source says

> The Treasure Valley’s Inspection and Maintenance (I/M) p rograms were implemented to help reduce air pollutants. 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. Additionally, air quality in the Treasure Valley has improved over the past three decades and the area is currently meeting all national health-based standards. 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.

## Source

- https://www.deq.idaho.gov/air-quality/vehicle-emissions/

Last verified: 2026-08-24. Review by: 2027-08-24.
Part of [Vehicle emissions testing: which counties require it, in which states](https://referencesource.org/vehicle-emissions-testing-by-state/).