Which of the following methods is effective in reducing vehicle-related air pollution?

Implementing cleaner fuels is an effective method for reducing vehicle-related air pollution because it directly addresses the chemical composition of the emissions produced by vehicles. Cleaner fuels, such as those with lower sulfur content or those that are bio-based, are designed to burn more efficiently and produce fewer harmful pollutants, including particulate matter, nitrogen oxides, and volatile organic compounds. This results in an overall reduction in emissions that contribute to air quality degradation and health problems associated with air pollution.

Furthermore, cleaner fuels can result in improved combustion efficiency, leading to better engine performance while simultaneously reducing the environmental impact of transportation. Transitioning to cleaner fuels is a crucial step in any comprehensive strategy aimed at minimizing air pollution, particularly in urban areas where vehicle emissions are a significant source of air quality issues. In contrast, the other options would likely exacerbate pollution and contribute to deteriorating air quality.