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

Molnár, Péter; Janhäll, Sara; Hallquist, Mattias

doi:10.1016/s1352-2310(02)00183-8

Cited by 87 publications

(64 citation statements)

References 22 publications

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“…In the winter time the concentration peaking was a bit stronger during the morning rush hours than during evening rush hours. Williams et al (2000), Molnár et al (2002), Wehner et al (2002), Charron and Harrison (2003), and Janhäll et al (2004) observed stronger concentration peaks during the morning rush hour. Wehner et al associated the higher morning concentrations with the higher truck traffic rate.…”

Section: Correlation Of Particle Emissions and Traffic Ratementioning

confidence: 93%

“…These larger particles contain the traffic related soot particles with volatile materials condensed on them. In addition, this size range contains Aitken mode particles and aged, non-traffic related accumulation mode particles (Longley et al, 2004;Molnár et al, 2002). The fraction of aged accumulation mode particles can be remarkable especially when the traffic rate is low.…”

Section: Correlation Of Particle Emissions and Traffic Ratementioning

confidence: 99%

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Winter and summer time size distributions and densities of traffic-related aerosol particles at a busy highway in Helsinki

et al. 2006

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Abstract. Number concentrations and size distributions of traffic related aerosol particles were measured at a roadside in Helsinki during two winter campaigns (10-26 February 2003, 28 January-12 February 2004 and two summer campaigns (12-27 August 2003, 6-20 August 2004. The measurements were performed simultaneously at distances of 9 m and 65 m from the highway. Total number concentrations were measured by a condensation particle counter (CPC) and particle size distributions by a scanning mobility particle sizer (SMPS) and an electrical low pressure impactor (ELPI). This study concentrates on data that were measured when the wind direction was from the road to the measurement site. The total concentrations in the wintertime were 2-3 times higher than in the summertime and the concentrations were dominated by nucleation mode particles. The particles smaller than 63 nm (aerodynamic diameter) constituted ∼90% of all particles in the wintertime and ∼80% of particles in the summer time. The particle total concentration increased with increasing traffic rate. The effect of traffic rate on particles smaller than 63 nm was stronger than on the larger particles. The particle distributions at the roadside consisted of two distinguishable modes. The geometric mean diameter (GMD) of nucleation mode (Mode 1) was 20.3 nm in summer and 18.9 nm in winter. The GMD of the larger mode consisting mostly of traffic related soot particles (Mode 2) was 72.0 nm in summer and 75.1 nm in winter. The GMD values of the modes did not depend on the traffic rate. The average particle density for each mode was determined by a parallel density fitting method based on the size distribution measurement made by ELPI and SMPS. The average density value for Mode 1 particles Correspondence to: A. Virtanen (annele.virtanen@tut.fi) was 1.0±0.13 g/cm 3 and 1.0±0.07 g/cm 3 both in summer and winter respectively, while the average density value for Mode 2 was 1.5±0.1 g/cm 3 and 1.8±0.3 g/cm 3 for summer and winter, respectively.

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Section: Correlation Of Particle Emissions and Traffic Ratementioning

confidence: 93%

Section: Correlation Of Particle Emissions and Traffic Ratementioning

confidence: 99%

Winter and summer time size distributions and densities of traffic-related aerosol particles at a busy highway in Helsinki

et al. 2006

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“…The most frequently performed measurements, consisting in determination of mass concentration, are more and more often accompanied by determination of the concentration in terms of the number of particles emitted into the environment (as it often happens in case of determination of exposure to ultrafine particles in communal environment) [21][22][23]. The surface area concentration of particles is a parameter determined sporadically, usually in experimental rather than real conditions.…”

Section: Photomentioning

confidence: 99%

Exposure to diesel exhaust fumes in the context of exposure to ultrafine particles

Bujak-Pietrek

Mikołajczyk

Kamińska

et al. 2016

Int J Occup Med Environ Health

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Objectives: Diesel exhaust fumes emission is a significant source of ultrafine particles, the size of which is expressed in nanometers. People occupationally exposed to diesel exhaust particles include mainly workers servicing vehicles with engines of this type. This article presents the analysis of measurements of ultrafine particle concentrations occurring in the bus depot premises during the work connected with everyday technical servicing of buses. Material and Methods: The measurements were carried out in the everyday servicing (ES) room of the bus depot before, during and after the work connected with bus servicing. Determinations included: particle concentrations in terms of particle number and particle surface area, and mass concentrations of aerosol. Results: Mean value of number concentration of 10-to 1000-nm particles increased almost 20-fold, from 7600 particles/cm 3 before starting bus servicing procedures to 130 000 particles/cm 3 during the bus servicing procedures in the room. During the procedures, the mean surface area concentration of particles potentially deposited in the alveolar (A) region was almost 3 times higher than that of the particles depositing in the tracheo-bronchial (TB) region: 356.46 μm 2 /cm 3 vs. 95.97 μm 2 /cm 3 , respectively. The mass concentration of the fraction of particulate matter with aerodynamic diameter 0.02-1 μm (PM 1 ) increased 5-fold during the analyzed procedures and was 0.042 mg/m 3 before, and 0.298 mg/m 3 while the procedures continued. Conclusions: At the time when bus servicing procedures continued in the ES room, a very high increase in all parameters of the analyzed particles was observed. The diesel exhaust particles exhibit a very high degree of fragmentation and, while their number is very high and their surface area is very large, their mass concentration is relatively low. The above findings confirm that ultrafine particles found in diesel exhaust fumes may be harmful to the health of the exposed people, and to their respiratory tract in particular.

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“…Thus, various studies have measured nanoparticles (modal diameter range of 20-30 nm) from diesel engines (Kittelson, 1998;Vaaraslahti et al, 2004) and in the urban roadside atmosphere Molnar et al, 2002;Charron and Harrison, 2003;Hasegawa et al, 2004;Kumar et al, 2008a). Nanoparticles are formed in the exhaust pipes by nucleation during cooling of hot exhaust over 100 °C (Kubo et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Seasonal differences of the atmospheric particle size distribution in a metropolitan area in Japan

Fujitani

Kumar

Tamura

et al. 2012

Science of The Total Environment

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

Cited by 87 publications

References 22 publications

Winter and summer time size distributions and densities of traffic-related aerosol particles at a busy highway in Helsinki

Winter and summer time size distributions and densities of traffic-related aerosol particles at a busy highway in Helsinki

Exposure to diesel exhaust fumes in the context of exposure to ultrafine particles

Seasonal differences of the atmospheric particle size distribution in a metropolitan area in Japan

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