中文摘要PM2.5是城市大气复合污染中的重要污染物。
PM2.5 is one of the critical pollutants involving regional and complex air pollution in Beijing.
文摘：随着环境污染日趋严重，现代城市建设面临着生态环境危机。
Abstract: Urban development is facing an ecological crisis as the destruction of environment.
文摘：随着环境污染日趋严重，现代城市建设面临着生态环境危机。
Abstract: Urban development is facing an ecological crisis as the destruction of environment.
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