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下雪对于PM2.5没有清洁作用？

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  •   saharabear · Feb 12, 2013 · 2912 views
    This topic created in 5001 days ago, the information mentioned may be changed or developed.
    刚下了雪，一查PM2.5还是170,下雪前是190.

    不算小的雪了，就没个清洁作用？
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