What method can be used to effectively reduce oxides of nitrogen emissions?

The correct answer—installing catalytic converters in cars—is effective in reducing oxides of nitrogen (NOx) emissions because these devices are specifically designed to convert harmful pollutants produced during combustion processes into less harmful substances. Catalytic converters use catalysts to facilitate chemical reactions that convert nitrogen oxides into nitrogen and oxygen, which are harmless components of the atmosphere.

By employing this technology in vehicles, car manufacturers can minimize the amount of NOx released during engine operation, thus playing a significant role in efforts to improve air quality and reduce the environmental impact of automotive emissions. Catalytic converters are widely used in modern vehicles and comply with strict emission regulations, reflecting their importance and effectiveness in reducing these types of pollutants.

In contrast, adding more lead to gasoline poses significant health and environmental risks, as lead is a toxic substance that can contaminate air and water. Eliminating all vehicles is impractical and would not realistically address transportation needs or economic factors. Increasing industrial emissions would only exacerbate the problem of air pollution, including higher levels of nitrogen oxides, leading to more serious health and environmental issues. Therefore, the option of installing catalytic converters presents a feasible and beneficial method for reducing NOx emissions.