title: [Study on number concentration distribution of atmospheric ultrafine particles in Hangzhou].
abstract: Atmospheric ultrafine particles (UFPs) were measured with fast mobility particle sizer(FMPS) in Hangzhou, during March 2011 to February 2012. The number concentration and size distribution of UFPs associated with meteorology were studied. The results showed that the number concentration of UFPs was logarithmic bi-modal distribution, and the seasonal levels presented winter > summer > spring> autumn. The highest monthly average concentration was 3.56 x 10(4) cm-3 in December and the lowest was 2.51 x 10(4) cm-3 in October. The seasonal values of count medium diameter(CMD) were spring > winter > autumn > summer. The highest monthly average CMD was 53. 51 nm in April and the lowest was 16.68 nm in June. Meteorological factors had effects on concentration of UFPs.
authors.affiliation: College of Metrology & Measurement Engineering, China Jiliang University,Hangzhou 310018, China. dragonxxf@163.com
authors.forename: Xiao-Fang
authors.initials: XF
authors.lastname: Xie
authors.forename: Zai
authors.initials: Z
authors.lastname: Sun
authors.forename: Zhi-Min
authors.initials: ZM
authors.lastname: Fu
authors.forename: Wen-Jun
authors.initials: WJ
authors.lastname: Yang
authors.forename: Jian-Zhong
authors.initials: JZ
authors.lastname: Lin
mesh_terms: D000336:Aerosols / Q000032:analysis*; D000393:Air Pollutants / Q000032:analysis*; D001272:Atmosphere; D002681:China; D002947:Cities; D004784:Environmental Monitoring; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis*
chemical_list: D000336:Aerosols; D000393:Air Pollutants; D052638:Particulate Matter