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Roadside measurements of fine and ultrafine particles at a major road north of Gothenburg

Journal article
Authors Peter Molnár
Sara Janhäll
Mattias Hallquist
Published in Atmospheric Environment
Volume 36
Issue 25
Pages 4115-4123
ISSN 1352-2310
Publication year 2002
Published at Department of Physics (GU)
Pages 4115-4123
Language en
Links doi:10.1016/S1352-2310(02)00183-8
Keywords traffic emissions, ultrafine particles, sulphur, pm2.5, size distribution, dmps, air-pollution, submicrometer particles, particulate matter, vehicle emissions, atmosphere, number, health, size
Subject categories Physical Sciences, Meteorology and Atmospheric Sciences

Abstract

Particle measurements were conducted at a road site 15 km north of the city of Gothenburg for 3 weeks in June 2000. The size distribution between 10 and 368 nm was measured continuously by using a differential mobility particle sizer (DMPS) system. PM2.5 was sampled on a daily basis with subsequent elemental analysis using EDXRF-spectroscopy. The road is a straight four-lane road with a speed limit of 90 kph. The road passing the site is flat with no elevations where the vehicles run on a steady workload and with constant speed. The traffic intensity is about 20,000 cars per workday and 13,000 vehicles per day during weekends. The diesel fuel used in Sweden is low in sulphur content (< 10 ppm) and therefore the diesel vehicles passing the site contribute less to particle emissions in comparison with other studies. A correlation between PM2.5 and accumulation mode particles (100-368 nm) was observed. However, no significant correlation was found between number concentrations of ultrafine particles (10-100 nm) and PM2.5 or the accumulation mode number concentration. The particle distribution between 10 and 368 nm showed great dependency on wind speed and wind direction, where the wind speed was the dominant factor for ultrafine (10-100nm) particle concentrations. The difference in traffic intensity between workday and weekend together with wind data made it possible to single out the traffic contribution to particle emissions and measure the size distribution. The results presented in combination with previous studies show that both PM2.5 and the mass of accumulation mode particles are bad estimates for ultrafine particles. (C) 2002 Elsevier Science Ltd. All rights reserved.

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