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Required in some areasSources checked Oct 6, 2026

Indiana emissions testing rules

Indiana tests vehicles only in Lake and Porter counties in Northwest Indiana, every two years, through the Clean Air Car Check program. A 2025 state law (SEA 103) directs IDEM to work toward the eventual phase-out of the program, but testing is still required today.

Program changes

Senate Enrolled Act 103, signed on May 6, 2025, requires IDEM to identify strategies that would result in the eventual phase-out of the inspection and maintenance program. The program continues until that happens.

“Senate Enrolled Act 103 (SEA 103) was passed by the Indiana General Assembly in April 2025 and signed by Governor Braun on May 6, 2025.”

  • “(B) Result in the eventual phase out of the inspection and maintenance program for light duty”

Where testing is required

Indiana's testing requirement applies in Lake and Porter counties.

“Indiana’s vehicle emissions testing requirements apply in Lake and Porter counties.”

Which vehicles are tested

Vehicles registered in Lake and Porter counties that were built after 1975 and weigh 9,000 pounds GVWR or less get an emissions test and tampering inspection every two years.

“Vehicles registered in Lake and Porter counties are required to undergo emissions tests and tampering inspections every two years if they were manufactured after 1975 and have a gross vehicle weight rating (GVWR) of 9,000 pounds or less.”

How often

Odd model years test in odd-numbered years and even model years in even-numbered years.

“Vehicles manufactured in odd-numbered years are tested during odd-numbered years and vehicles manufactured in even-numbered years are tested during even-numbered years.”

Exemptions

Exemptions include the four latest model years and antique vehicles.

“Exemptions include vehicles manufactured during the four latest model years and antique vehicles”

Indiana emissions testing questions

Does Indiana require emissions testing?

Yes. Required in some areas. Indiana's testing requirement applies in Lake and Porter counties.

Which vehicles need an emissions test in Indiana?

Vehicles registered in Lake and Porter counties that were built after 1975 and weigh 9,000 pounds GVWR or less get an emissions test and tampering inspection every two years.

How often is the emissions test in Indiana?

Odd model years test in odd-numbered years and even model years in even-numbered years.

Which vehicles are exempt in Indiana?

Exemptions include the four latest model years and antique vehicles.

Sources

Every quotation above is checked word for word against our saved copy of the page, on the date shown. Rules change; if a page has moved or says something different, tell us at the corrections page.