一次连续在线观测分析天津市细颗粒物污染特征

根据2005年的5月17日—5月23日GR IMM(1.109#)谱分析仪在线观测结果考察天津市细颗粒物浓度和质量浓度特征。观测期间,天津市颗粒物数浓度平均值为1 124 cm-3,粒径分布为0.25μm~0.60μm,98.5%粒子的粒径0.65μm。同期PM10日均质量浓度值为204μg/m3,ρ(PM2.5)为104μg/m3,ρ(PM1.0)为82.9μg/m3。ρ(PM1.0)/ρ(PM2.5)超过80%,粒径1μm超细颗粒物为天津城市大气颗粒物的主要成分。

Characteristics AnalysisofAir Fine Particles Pollution by A Continuous On-lineM onitoringin Tianjin

The mass and number concentration of fine particles of Tianjin was observed by a on-line monitoring work with GRIMM（1.109#）during the period of May 2005.The particles number concentration was 1 124 cm-3 with their diameters between 0.25 μm and 0.60 μm.The particles with diameters less than 0.65 μm accounted for 98.5% in the atmosphere,while the mass concentrations of PM10,PM2.5 and PM1.0 were 204 μg/m3,104 μg/m3 and 82.9 μg/m3 respectively.Result showed that the percentage of PM1.0/PM2.5 concentration accounted for more than 80%,which indicated that dominated aerosol in Tianjin were ultra fine particles below 1 μm diameter.