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Vehicle Emissions Testing Program

  • Air Quality
  • Current: Vehicle Emissions Testing Program

Indiana’s vehicle emissions testing program contributes to reduced ozone pollution and healthier air quality in Northwest Indiana. Breathing ground level ozone is unhealthy for anyone but can be particularly harmful for sensitive groups, including asthmatics, young children, and the elderly. Ozone at ground level also harms ecosystems and delicate plant life.

Ozone is not emitted directly into the air by any one source but rather, forms at ground level when emissions of nitrogen oxides (NOx) and volatile organic compounds (VOCs) react chemically in the atmosphere. Tailpipe emissions and gasoline vapors are significant sources of NOx and VOCs in the atmosphere. Indiana’s vehicle emissions testing program, called Clean Air Car Check Program, serves to protect public health by identifying vehicles that emit high levels of NOx and/or VOCs and ensuring the repair of faulty emissions systems. Once repaired, these vehicles not only pollute less but often experience better performance and fuel economy.

Vehicle Testing Locations, Hours, Requirements, and Services

Indiana’s vehicle emissions testing requirements apply in Lake and Porter counties. Citizens may obtain information concerning testing locations and hours, requirements, and services from the Clean Air Car Check site.

General Information

If you have questions, comments, or need additional information about Indiana’s vehicle emission testing program, please contact the Office of Air Quality.

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