NDLI: Reducing dust exposure in indoor climbing gyms

Content Provider	Royal Society of Chemistry (RSC)
Author	Weinbruch, Stephan Dirsch, Thomas Heimburger, Gerhard Ebert, Martin Kandler, Konrad Hohenwarter, Franz
Copyright Year	2012
Abstract	As users of indoor climbing gyms are exposed to high concentrations (PM10 up to 4000 μg m−3; PM2.5 up to 500 μg m−3) of hydrated magnesium carbonate hydroxide (magnesia alba), reduction strategies have to be developed. In the present paper, the influence of the use of different kinds of magnesia alba on dust concentrations is investigated. Mass concentrations, number concentrations and size distributions of particles in indoor climbing gyms were determined with an optical particle counter, a synchronized, hybrid ambient real-time particulate monitor and an electrical aerosol spectrometer. PM10 obtained with these three different techniques generally agreed within 25%. Seven different situations of magnesia alba usage were studied under controlled climbing activities. The use of a suspension of magnesia alba in ethanol (liquid chalk) leads to similar low mass concentrations as the prohibition of magnesia alba. Thus, liquid chalk appears to be a low-budget option to reduce dust concentrations. Magnesia alba pressed into blocks, used as powder or sieved to 2–4 mm diameter, does not lead to significant reduction of the dust concentrations. The same is true for chalk balls (powder enclosed in a sack of porous mesh material). The promotion of this kind of magnesia alba as a means of exposure reduction (as seen in many climbing gyms) is not supported by our results. Particle number concentrations are not influenced by the different kinds of magnesia alba used. The particle size distributions show that the use of magnesia alba predominantly leads to emission of particles with diameters above 1 μm.
Starting Page	2114
Ending Page	2120
Page Count	7
File Format	HTM / HTML PDF
ISSN	14640325
Volume Number	14
Issue Number	8
Journal	Journal of Environmental Monitoring
DOI	10.1039/c2em30289f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Particulates Magnesium carbonate Hydroxide Particle counter Electrical aerosol spectrometer Ethanol Periclase Particle number Micrometre
Content Type	Text
Resource Type	Article
Subject	Public Health, Environmental and Occupational Health Management, Monitoring, Policy and Law

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