Final answer:
Countries in Northwestern Europe are addressing environmental issues caused by acid rain by implementing strict regulations on vehicle emissions.
Step-by-step explanation:
Countries in Northwestern Europe are addressing environmental issues caused by acid rain by implementing strict regulations on vehicle emissions. This helps to reduce the release of sulfur and nitrogen oxides into the atmosphere, which are major contributors to acid rain formation.
By controlling vehicle emissions, these countries aim to reduce the impact of acid rain on forests, lakes, and other ecosystems.