Which method is typically used to control vehicle emissions?

Fuel standards regulation is the primary method used to control vehicle emissions because it establishes specific limits on the amount of pollutants that vehicles can emit. By implementing stringent fuel standards, regulatory agencies can encourage the production and sale of cleaner fuels that produce fewer emissions when burned. This not only reduces harmful air pollutants such as nitrogen oxides, particulate matter, and volatile organic compounds but also promotes advancements in vehicle technology, including the adoption of electric and hybrid vehicles.

Other options do not directly target emissions control. Increased road construction may inadvertently lead to more vehicles on the road, potentially increasing emissions. Expanded parking availability does not address the emissions generated by vehicles themselves and could, in fact, encourage more driving. Participation in international agreements can help set global emissions standards but often relies on national regulations, such as fuel standards, to be effective in practical terms.