A regionwide directive by the EU mandates stricter air quality standards, and Sweden, Denmark and Germany are taking measures to avoid fine particle emissions from diesel engines through taxes and the use of fine particle filters.
欧盟在其全区域指令中规定了更严格的空气质量标准，瑞典、丹麦和德国也在采取措施，通过收税和使用微粒过滤器，避免柴油机排放微粒。