How often is a biennial smog inspection required for most vehicles in California?

In California, most vehicles are required to undergo a biennial smog inspection, which means these vehicles must be tested every two years. This regulation is designed to help reduce air pollution by ensuring that vehicles meet the necessary emissions standards.

The frequency of these inspections is determined by the state's efforts to maintain air quality and public health. By requiring inspections every two years, California aims to balance the need for compliance with emissions standards and the burden on vehicle owners.

Other options suggest more frequent or less frequent inspections, which do not align with the established regulations in California. Overall, the biennial requirement reflects a commitment to reducing emissions while being practical for vehicle owners.