沈阳市环境空气质量"优级"气象条件分析

利用2003年～2005年沈阳市空气质量为“优级“天气的监测数据和同期气象数据进行分析,结果表明:在两种气象条件下环境空气质量能够达到“优级“水平,第一是连续降水的后期,由于一定强度的连续降水对空气中污染物有明显的冲刷冲洗作用,降水后期空气中污染物浓度持续降低.第二是低空或高空有强冷空气时,地面吹北风且风速较大,在水平方向和垂直方向扩散条件好,使空气质量达到“优级“.

The Analyze of Meteorological Conditions About Best air Quality in Shenyang

Using monitoring data from 2003 to 2005 we found the days on which the air quality was best.At the same time we got the meteorological data.The result showed that the air quality was best on two weather conditions.One was on the latter of continuing precipitation.Continuing precipitation could wash pollution out of the air.On the latter of continuous precipitation the concentration of pollution was very low.Two was that there was strong cold stream on surface or high altitude.On surface the wind director was north,and wind speed was high.On the above condition the air quality was best.