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中国西藏网
5 天
前10月北京重污染天同比减少6天
本报讯(记者 骆倩雯)市生态环境局近日介绍,今年1月至10月,北京市PM2.5平均浓度为31微克/立方米,同比下降3.1%。优良天数234天,同比增加16天;重污染2天(含1天沙尘影响),同比减少6天。不过,秋冬季以来,京津冀及周边区域发生了4次大范围、长时间的污染过程,空气质量改善仍需坚持不懈。
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