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Abstract: Monitoring of UFP concentration and size distribution at four urban background sites in NW-Europe
Staelens, J.; Hofman, J.; Hama, S.M.L.; Wyche, K.P.; Kos, G.P.A.; Matheeussen, C.; Cordell, R.; Laan, J. van der; Meydam, J.; Smallbone, K.L.; Frumau, K.F.A.; Weijers, E.P.; Monks, P.; Roekens, E.
Published by: Publication date:
ECN Environment & Energy Engineering 18-3-2015
ECN report number: Document type:
ECN-M--15-014 Conference Paper
Number of pages: Full text:
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Within the Joaquin project, ultrafine particles (UFP) are continuously measured at one urban background location in four cities in NW-Europe (Amsterdam, Antwerp, Leicester and London). The main aims are to investigate the temporal variation in UFP number concentration and size distribution, to assess the added value of UFP data in addition to more common parameters such as nitrogen oxides (NOx) and black carbon (BC) and to evaluate the feasibility of long-term UFP measurements within air quality monitoring networks. At all sites the total particle number concentration (PNC) was measured with a condensation particle counter (TSI-3783, particles < 1 ┬Ám) and BC with a MAAP (Thermo-5012). Information on the particle size distribution was obtained by a scanning mobility particle sizer (Grimm-5420/LDMA) in Amsterdam and Antwerp and by a differential mobility analyzer with corona discharger and electrometer (TSI-3031) in Leicester and London. To assess instrument comparability, there was an initial measurement campaign in Antwerp and follow-up comparisons at the four sites using a mobile trailer. The agreement between devices of the same type was good (<10% difference), but the total PNC was underestimated by the sizeresolved devices compared with the particle counters. Results will be presented based on 1-2 years of measurements, depending on the site. UFP, BC and NO2 showed a clear traffic-related diurnal variation with morning and evening rush hour peaks on weekdays, but only a clear evening peak in the weekends. The relative distribution of particles in 5 size classes from 20 to 200 nm was quite similar at all sites, with the highest particle number in the 30-50 nm class. BC and NO2 were correlated with the total and size-specific PNC, but the relationships depended on the site, probably reflecting differences in local site and traffic characteristics. Acknowledgment: this work is supported by the Interreg IVB North-West Europe programme.

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