How often does Maryland require vehicle emissions testing?

In Maryland, vehicle emissions testing is required every two years for most vehicles. This testing is part of the state's efforts to reduce air pollution and ensure that vehicles meet certain environmental standards. By conducting emissions testing on a biennial basis, Maryland can monitor the emissions from vehicles on the road and help to identify those that may need repairs or adjustments to comply with emissions regulations.

This two-year cycle helps to ensure that vehicles are regularly assessed for their environmental impact, which contributes to improved air quality and complies with federal air quality standards. Additionally, certain vehicles, such as those that are newer or are not registered for certain exemptions, may be exempt from this requirement, but the general rule is that most vehicles must undergo emissions testing every two years.