Answer :
Final answer:
Western Europe has employed several strategies to reduce air pollution, including catalytic converters, improved engine efficiency, and cleaner-burning fuels.
Explanation:
Western Europe's efforts to reduce air pollution have included various measures, such as requiring catalytic converters, improving engine efficiency, and using cleaner-burning fuels. However, increasing transnationalism is not directly related to reducing air pollution.
Learn more about Air pollution reduction efforts in Western Europe here:
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