Evaluation of workplace exposure to respirable crystalline silica in road construction industries in Alberta. 2023

Ariel Couture, and Rose Marie Charuvil Elizabeth, and Lianne Lefsrud, and Fereshteh Sattari
Department of Mechanical Engineering, University of Alberta, Edmonton, AB, Canada.

Occupational exposure to respirable crystalline silica (RCS) is common for several occupations in construction, not only because of its presence in many handling materials but also in processes such as grinding and sawing. This study investigated workplace exposure to RCS as quartz in industries and occupations within road construction in Alberta through the RCS monitoring database provided by the Alberta Roadbuilders and Heavy Construction Association (ARHCA) between 2007 and 2016. Descriptive statistics were calculated for exposure-related variables, and mixed model analysis was performed to determine factors affecting the exposure levels. Results showed that the highest exposed workers were in the sand and gravel industry (GM = 45 μg/m3). For worker occupations, geometric means ranged from 78 μg/m3 for crusher operators to 10 μg/m3 for concrete truck operators. The maximum exposure severity was 33.3 times the occupational exposure limit (OEL) for the sand and gravel and 31 times the OEL for tower operators. The results also showed the effect of seasonal variability on RCS exposure levels. The heterogeneous exposure results indicated significant room for improvement and that controls should focus more on the activity performed than the occupation to lower exposure to RCS levels in industries.

UI MeSH Term Description Entries
D004391 Dust Earth or other matter in fine, dry particles. (Random House Unabridged Dictionary, 2d ed) House Dust,Housedust,Dust, House
D004784 Environmental Monitoring The monitoring of the level of toxins, chemical pollutants, microbial contaminants, or other harmful substances in the environment (soil, air, and water), workplace, or in the bodies of people and animals present in that environment. Monitoring, Environmental,Environmental Surveillance,Surveillance, Environmental
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000080463 Sand A hard granular material that is a component of soil. It is composed of very small pieces (between 0.06 and 2.0 millimeters in diameter) of disintegrating rock. Sands
D000395 Air Pollutants, Occupational Toxic air-borne matter related to work performed They are usually produced by the specific nature of the occupation. Occupational Air Pollutants,Pollutants, Occupational Air
D000416 Alberta A province of western Canada, lying between the provinces of British Columbia and Saskatchewan. Its capital is Edmonton. It was named in honor of Princess Louise Caroline Alberta, the fourth daughter of Queen Victoria. (From Webster's New Geographical Dictionary, 1988, p26 & Room, Brewer's Dictionary of Names, 1992, p12)
D012822 Silicon Dioxide Transparent, tasteless crystals found in nature as agate, amethyst, chalcedony, cristobalite, flint, sand, QUARTZ, and tridymite. The compound is insoluble in water or acids except hydrofluoric acid. Silica,Aerosil,Aerosil 380,Cristobalite,Quso G-32,Quso G32,Tridymite,380, Aerosil,Dioxide, Silicon,G32, Quso,Quso G 32
D016273 Occupational Exposure The exposure to potentially harmful chemical, physical, or biological agents that occurs as a result of one's occupation. Exposure, Occupational,Exposures, Occupational,Occupational Exposures
D017132 Workplace Place or physical location of work or employment. Job Site,Work Location,Work Place,Work-Site,Worksite,Job Sites,Location, Work,Work Locations,Work Places,Work Site,Work-Sites,Workplaces,Worksites
D060389 Construction Industry The aggregate business enterprise of building. Building Industry,Building Trades,Construction Trades,Building Industries,Building Trade,Construction Industries,Construction Trade,Industries, Building,Industries, Construction,Industry, Building,Industry, Construction,Trade, Building,Trade, Construction,Trades, Building,Trades, Construction

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