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全球仅七国空气质量达标
瑞士空气质量技术公司IQAir发布的数据显示,只有澳大利亚、新西兰、爱沙尼亚、冰岛,以及岛国巴哈马(Bahamas)、巴巴多斯(Barbados)和格林纳达(Grenada)的空气质量符合世卫组织制定的悬浮颗粒PM2.5浓度标准,即每立方米不超过5微克。空气质量达标的城市则仅占全球17%。
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