What type of emissions test is required for vehicles in Maine?

In Maine, vehicles undergo an emissions test that can include either a two-speed idle test or a visual inspection, particularly for older vehicles. The two-speed idle test measures the amount of pollutants emitted from the vehicle's exhaust system at idle speeds and helps identify vehicles that have excessive emissions. The visual inspection, on the other hand, checks for signs of tampering with the emissions control systems, such as the catalytic converter or other essential components.

This approach helps ensure that vehicles do not contribute excessively to air pollution, aiming to maintain air quality standards. The combination of these testing methods allows for a more comprehensive assessment of a vehicle’s emissions performance, ensuring that older vehicles, which may lack modern emissions controls, are still held to specific environmental standards. Therefore, the answer reflects Maine's requirements to ensure that all types of vehicles, especially those that are older, are evaluated appropriately for their emissions output.