美国的空气健康 – 1 级
27-08-2024 15:00
科学家研究空气污染。从 1999 年到 2015 年，他们在美国研究空气污染。他们观察空气中细微物质的含量。
这些微粒来自工业、发电厂，主要是汽车。一块物质比人的头发小 30 倍。如果您吸入这些物质，它们就会进入您的身体深处。
科学家发现，这种细小物质越来越少。然而，污染是危险的。它导致 3 万人死亡。
您可以在三级部分观看原始视频。
根据科学家的研究，空气中微粒物质的主要来源是什么？
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