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Using the daily PM2.5 concentration data in Beijing, the surface observations and upper-air sounding data from the regional weather stations in Beijing and North China during 2007-2008, the every-5-min AWS (Automatic Weather Station) observations, the hourly AMS (Aerosol Mass Spectrum) data in July 2008, this paper analyzed the related sensitive meteorological elements and meteorological conditions that impact PM2.5 concentration, and discussed the diagnosis and identification of the impact of meteorological conditions on air qualities (AQ).