Comparative Testing of a Miniature Diffusion Size Classifier to Assess Airborne Ultrafine Particles Under Field Conditions

Meier, Reto; Clark, Katherine; Riediker, Michael

doi:10.1080/02786826.2012.720397

Cited by 54 publications

(35 citation statements)

References 13 publications

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“…Logging interval was 1 s and for analysis, data were averaged over 1 min. QA measurements confirmed validity of these measurements under highway conditions for the particle size range from 16 to 300 nm (Meier et al, 2013).…”

Section: Measurement Of Ufpsupporting

confidence: 67%

“…The GM of PM 2.5Real-time during preparatory work was lower than values for Swedish garage workers working with petrol and diesel vehicles (Lewné et al, 2007). PNC during roadside activities without particle emitting working equipment were comparable with measurements at a highway toll station in Taiwan (Cheng et al, 2010) if adapted for the measured size range of the miniDiSC (Meier et al, 2013). On the other hand, they were clearly lower than reported for the 9-lane Freeway 405 in Los Angeles (Zhu et al, 2002).…”

Section: Discussionsupporting

confidence: 46%

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Exposure of Highway Maintenance Workers to Fine Particulate Matter and Noise

Meier

Cascio

Danuser

et al. 2013

The Annals of Occupational Hygiene

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in this study, we assessed the mixed exposure of highway maintenance workers to airborne particles, noise, and gaseous co-pollutants. the aim was to provide a better understanding of the workers' exposure to facilitate the evaluation of short-term effects on cardiovascular health endpoints. to quantify the workers' exposure, we monitored 18 subjects during 50 nonconsecutive work shifts. Exposure assessment was based on personal and work site measurements and included fine particulate matter (PM 2.5 ), particle number concentration (PNC), noise (leq), and the gaseous co-pollutants: carbon monoxide, nitrogen dioxide, and ozone. Mean work shift PM 2.5 concentrations (gravimetric measurements) ranged from 20.3 to 321 μg m −3 (mean 62 μg m −3 ) and PNC were between 1.6 × 10 4 and 4.1 × 10 5 particles cm −3 (8.9 × 10 4 particles cm −3 ). Noise levels were generally high with leq over work shifts from 73.3 to 96.0 dB(a); the averaged leq over all work shifts was 87.2 dB(a). the highest exposure to fine and ultrafine particles was measured during grass mowing and lumbering when motorized brush cutters and chain saws were used. Highest noise levels, caused by pneumatic hammers, were measured during paving and guardrail repair. We found moderate spearman correlations between PNC and PM 2.5 (r = 0.56); PNC, PM 2.5 , and Co (r = 0.60 and r = 0.50) as well as PNC and noise (r = 0.50). Variability and correlation of parameters were influenced by work activities that included equipment causing combined air pollutant and noise emissions (e.g. brush cutters and chain saws). We conclude that highway maintenance workers are frequently exposed to elevated airborne particle and noise levels compared with the average population. this elevated exposure is a consequence of the permanent proximity to highway traffic with additional peak exposures caused by emissions of the work-related equipment.

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Section: Measurement Of Ufpsupporting

confidence: 67%

Section: Discussionsupporting

confidence: 46%

Exposure of Highway Maintenance Workers to Fine Particulate Matter and Noise

Meier

Cascio

Danuser

et al. 2013

The Annals of Occupational Hygiene

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show abstract

“…To avoid artifacts due to coarse particles, the DiSCmini is equipped with an inlet separator with a cutoff diameter of 700 nm. This device has previously been studied in laboratory conditions [30][31][32][33] as well as in field conditions [34][35][36]. In this study, ten specimens of DiSCmini were challenged by the different test aerosols.…”

Section: Diffusion Chargersmentioning

confidence: 99%

Performance study of portable devices for the real-time measurement of airborne particle number concentration and size (distribution)

Bau

Payet

Witschger

et al. 2017

J. Phys.: Conf. Ser.

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“…In this regard, none of these two conditions were achieved, since no single value was reported to exceed 3 times the NRV ([120,000 particle/cm 3 ). Finally, despite the presented approach followed the main available technical recommendations on the harmonization of the strategies for measuring exposure to ENPs (Methner et al 2009a;Cornelissen et al 2012;Meier et al 2013;Brouwer et al 2012;Asbach et al 2012a), some limitations in the study design and methods could have had an impact on the exposure assessment: these are mainly associated with the use of the count-difference method to estimate the particle number concentrations of ENPs and with directreading instruments sensitivity. In particular, the distinction of nano-TiO 2 from background aerosols was performed by the quantification of the background concentrations (mean pre-and post-activity concentrations) and assuming that the emissions during process are stable during the measurements (Koivisto et al 2012a(Koivisto et al , b, 2014Koponen et al 2015;Jensen et al 2015).…”

Section: Discussionmentioning

confidence: 99%

Titanium dioxide nanoparticles: occupational exposure assessment in the photocatalytic paving production

et al. 2016

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Limited data are available regarding occupational exposure assessment to nano-sized titanium dioxide (nano-TiO2). The objective of this study is to assess the occupational exposure of workers engaged in the application of nano-TiO2 onto concrete building materials, by means of a multi-metric approach (mean diameter, number, mass and surface area concentrations). The measurement design consists of the combined use of (i) direct-reading instruments to evaluate the total particle number concentrations relative to the background concentration and the mean size-dependent characteristics of particles (mean diameter and surface area concentration) and to estimate the 8-h time-weighted average (8-h TWA) exposure to nano-TiO2 for workers involved in different working tasks; and (ii) filter-based air sampling, used for the determination of size-resolved particle mass concentrations. A further estimation was performed to obtain the mean 8-h TWA exposure values expressed as mass concentrations (µg nano-TiO2/m3). The multi-metric characterization of occupational exposure to nano-TiO2 was significantly different both for different work environments and for each work task. Generally, workers were exposed to engineered nanoparticles (ENPs; <100 nm) mean levels lower than the recommended reference values and proposed occupational exposure limits (40,000 particle/cm3; 300 µg/m3) and relevant exposures to peak concentration were not likely to be expected. The estimated 8-h TWA exposure showed differences between the unexposed and exposed subjects. For these last, further differences were defined between operators involved in different work tasks. This study provides information on nano-TiO2 number and mass concentration, size distribution, particles diameter and surface area concentrations, which were used to obtain work shift-averaged exposures

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Comparative Testing of a Miniature Diffusion Size Classifier to Assess Airborne Ultrafine Particles Under Field Conditions

Cited by 54 publications

References 13 publications

Exposure of Highway Maintenance Workers to Fine Particulate Matter and Noise

Exposure of Highway Maintenance Workers to Fine Particulate Matter and Noise

Performance study of portable devices for the real-time measurement of airborne particle number concentration and size (distribution)

Titanium dioxide nanoparticles: occupational exposure assessment in the photocatalytic paving production

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