2月17日晨，在北京石景山区一居民小区内，居民在打扫小区道路上的积雪。

Residents living in Shijingshan district clear snow on the road in Beijing, capital of China, Feb. 17, 2009.

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交流会地址：北京石景山区晋元庄路5号（西五环晋元桥西北角）北方工业大学主校区内。

The address of the exchange: Beijing Shijingshan District Jinyuanzhuang Road, NO. 5(Northwest corner of the Jinyuan bridge at the west of fifth ring )in the main campus of NCUT.

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分析了北京市石景山区秋季PM _(10)质量浓度的变化特征，发现气候变化对PM _(10)质量浓度有很大影响。

This paper analyses the change of PM_ (10) mass concentration at Shijingshan District in autumn, and finds that climate change affects PM_ (10) mass concentration greatly.

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