Diverging long-term trends in ambient urban particle mass and number concentrations associated with emission changes caused by the German unification
- 作者：Kreyling ; Wolfgang G. ; Tuch ; Thomas ; Peters ; Annette ; Pitz ; Mike ; Heinrich ; Joachim ; Stö ; lzel ; Matthias ; et. al.
- 关键词：Airborne particulate matter ; Ambient urban aerosol ; Germany ; Particle concentration ; number ; mass ; fine particles ; ultrafine particles ; winter trends
- 刊名：Atmospheric Environment
- 出版年：2003
- 期刊代码：11_13522310
- 类别：env
- 出版时间：September, 2003
- 卷：37
- 期：27
- 页码：3841-3848
- 文件大小：520 K
摘要
Air quality in urban areas has considerably changed over time. Recent changes of particle emissions in Eastern Germany during the last 10 years provide a quick motion picture of a development which lasted several decades in Western countries. Size distributions of fine particles (<2.5μm aerodynamic diameter) were measured during winters 1991/1992 through 2000/2001. Within these 10 years particle size distributions shifted strongly towards smaller sizes. This was mainly due to a twofold increase of the number concentration of 0.01–0.03μm sized particles. In parallel, fine particle mass concentration decreased by 75%.