Why might regulatory bodies focus on emissions testing for older vehicles?

Regulatory bodies focus on emissions testing for older vehicles primarily because these vehicles are generally less efficient and tend to produce higher levels of pollutants compared to newer models. Older vehicles may not incorporate the latest emissions control technologies, which are designed to minimize harmful emissions. Over time, wear and tear, along with the degradation of components that manage emissions, can lead to increased exhaust emissions in older cars.

By implementing emissions testing requirements for these vehicles, regulatory agencies aim to ensure that older vehicles remain compliant with environmental standards, thereby reducing air pollution and protecting public health. This focus helps in identifying vehicles that need repairs or upgrades to their emissions systems, ultimately leading to a cleaner environment.