The spatial and temporal variation of fine, ultrafine particles and gas phase parameters was assessed for the Bologna (Italy) area. Bologna is located in the south east of Po Valley, which is a well known atmospheric pollution critical area. This assessment is based on measurements on selected days during different seasons in 2008/2009, covering urban, suburban and rural regions. Special focus was put on the investigation of particles in the fine (< 2.5 μm) and ultrafine (< 100 nm) size ranges, in particular the effect of meteorological parameters on the ultrafine (UFP) number concentration and size distribution was examined. The number concentrations of ambient particles in the size range of 5.6-560 nm were obtained from a Fast Mobility Particle Sizer, FMPS 3091, TSI. Meteorological parameters including ambient temperature, relative humidity, wind speed, wind direction, rainfall, and solar radiation flux, H-mixing were also monitored. The time series analysis reveals the 12 h periodicity of the particle number and significant seasonal and daily variations were observed: the morning peak is related to traffic. Significant differences were also observed in the UPF concentrations in the monitored sites depending on traffic and local conditions. A multilinear regression model of the day average concentration of UFP vs, the average meteorologic parameters was built .
Spatial and Temporal Concentration of Ultrafine Particles in Rural and Urban Sites in the Po Valley (Bologna)
PASTI, Luisa;SARTI, Elena;
2012
Abstract
The spatial and temporal variation of fine, ultrafine particles and gas phase parameters was assessed for the Bologna (Italy) area. Bologna is located in the south east of Po Valley, which is a well known atmospheric pollution critical area. This assessment is based on measurements on selected days during different seasons in 2008/2009, covering urban, suburban and rural regions. Special focus was put on the investigation of particles in the fine (< 2.5 μm) and ultrafine (< 100 nm) size ranges, in particular the effect of meteorological parameters on the ultrafine (UFP) number concentration and size distribution was examined. The number concentrations of ambient particles in the size range of 5.6-560 nm were obtained from a Fast Mobility Particle Sizer, FMPS 3091, TSI. Meteorological parameters including ambient temperature, relative humidity, wind speed, wind direction, rainfall, and solar radiation flux, H-mixing were also monitored. The time series analysis reveals the 12 h periodicity of the particle number and significant seasonal and daily variations were observed: the morning peak is related to traffic. Significant differences were also observed in the UPF concentrations in the monitored sites depending on traffic and local conditions. A multilinear regression model of the day average concentration of UFP vs, the average meteorologic parameters was built .I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
