Spatial Distribution Of Ultrafine Particles At
Urban Scale: The Road-to-ambient Stage
Author(s)
F. Costabile, B. Zani & I. Allegrini
Abstract
The spatial variability of ultrafine particles (UFPs) is believed to be an important
issue to assess urban air pollution fate and exposure in connection with traffic
motorised emissions. In this work, the high-time resolution total number
concentration of UFPs was measured at traffic-oriented and urban background
locations in a middle-size city in Italy. The major objective was to study valuable
connections with local traffic sources, as well as measurement sites’
representativeness. On the one hand, it was found that the total concentration at
the traffic site can be representative of vehicle exhaust sources in ambient air. On
the other hand, it was possible to identify three prevailing contributions for the
total UFPs number concentration at urban scale: a very low urban background
concentration, a significant contribution due to local traffic sources, and a
significant contribution due to secondary transformation processes closely linked
to meteorology.
Keywords: urban air pollution, ultrafine particles, traffic emissions, background,
representativeness, exposure.
1 Introduction
During the last decades a growing body of research has investigated worldwide
the extremely vast subject of urban air quality [1]. Measuring any potential effect
of any urban air pollutant requires the understanding of its variation and
distribution in both space and time. Traffic-related pollution and its spatial
variations are particular concerns; a comprehensive understanding is crucial [2–
Keywords
urban air pollution, ultrafine particles, traffic emissions, background,
representativeness, exposure.
Related Book
Other papers in this volume
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