How much emissions test cost

Due to the effects of air pollution, or smog, emissions testing is required more often in urban areas and in states with high populations densities and large cities. Some states require emissions tests only in urban areas, simply because metropolitan areas can be more susceptible to carbon emissions than rural ones.

An example of this is in Illinois, where emissions tests are required biennially, every two years, in the Chicago area. Vehicle owners who live in rural areas are often exempt and some rural states do not require emissions tests at all. Simply put, an emissions test checks the cleanliness of your vehicle. The tests aim to ensure vehicles are in compliance with the requirements set by the federal Clean Air Act. Several factors may influence emissions testing requirements:.

Each state determines its own testing specifications. Depending on the testing apparatus, emissions testing can detect levels of hydrocarbons, nitrogen oxide, carbon monoxide, carbon dioxide, and emissions from evaporation. Emissions testing is separate from vehicle safety inspection in most states. Requirements and testing facilities may be independent for emissions and safety. Still, some testing locations might be qualified to perform both inspections. The cost of emissions testing varies from state to state.

If testing is required annually, the cost is generally lower. Some states offer a free retest if your vehicle fails an initial emissions test.

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 include vehicles manufactured during the four latest model years and antique vehicles as defined by IAC For instance, a vehicle with a manufacturer's model year of should be tested in , and tested again in and Bring your Indiana Vehicle Registration Renewal notice or your current registration with you to the testing station.

If your vehicle is driven by a college student who is away at school or if the vehicle is kept in another state for part of the year, early testing is recommended.