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如何在全球范围内推广城市空气清洁方案?
据世界卫生组织估计,空气污染每年导致全球420万人过早死亡,其中近一半的城市空气污染来自城市交通。尽管交通工具对城市活力至关重要,但若缺乏有效政策支持,交通仍将是有害空气污染的主要源头。
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