Airborne particulate matter and diesel engine exhaust on infrastructure construction sites in the Copenhagen metropolitan area

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Abstract

Diesel engine exhaust (DEE) is carcinogenic and potentially hazardous for those working in close proximity to diesel-powered machines. This study characterizes workplace exposure to DEE and its associated particulate matter (PM) during outdoor construction activities. We sampled at 4 construction sites in the Copenhagen metropolitan area. We used portable constant-flow pumps and quartz-fiber filters to quantify personal exposure to elemental carbon (EC), and used real-time instruments to collect activity-based information about particle number and size distribution, as well as black carbon (BC) concentration. Full-shift measurements of EC concentration ranged from < 0.3 to 6.4 µg/m3. Geometric mean (GM) EC exposure was highest for ground workers (3.4 µg/m3 EC; geometric standard deviation, GSD = 1.3), followed by drilling rig operators (2.6 µg/m3 EC; GSD = 1.4). Exposure for non-drilling-rig machine operators (1.2 µg/m3 EC; GSD = 2.9) did not differ significantly from background (0.9 µg/m3 EC; GSD = 1.7). The maximum 15-min moving average concentration of BC was 17 µg/m3, and the highest recorded peak concentration was 44 µg/m3. In numbers, the particle size distributions were dominated by ultrafine particles ascribed to DEE and occasional welding activities at the sites. The average total particle number concentrations (PNCs) measured in near-field and far-field positions across all worksites were 10,600 (GSD = 3.0) and 6,000 (GSD = 2.8)/cm3, respectively. Sites with active drilling rigs saw significantly higher average total PNCs at their near-field stations (13,600, 32,000, and 9,700/cm3; GSD = 2.4, 3.4, and 2.4) than sites without (4,700/cm3; GSD = 1.6). Overall, the DEE exposures at these outdoor construction sites were below current occupational exposure limits for EC (10 µg/m3 in Denmark; 50 µg/m3 in the European Union), but extended durations of exposure to the observed DEE levels may still be a health risk.
Original languageEnglish
JournalAnnals of Work Exposures and Health
Volume68
Issue number8
Pages (from-to)791-803
Number of pages13
ISSN2398-7308
DOIs
Publication statusPublished - 27 Sept 2024

Keywords

  • diesel exhaust particles
  • Elemental carbon
  • organic carbon
  • Construction workers
  • ultrafine particles
  • exposure measurements
  • operators
  • ground workers
  • drilling
  • digging
  • loading
  • Environmental Monitoring/methods
  • Humans
  • Workplace
  • Occupational Exposure/analysis
  • Particle Size
  • Construction Industry
  • Vehicle Emissions/analysis
  • Air Pollutants, Occupational/analysis
  • Inhalation Exposure/analysis
  • Carbon/analysis
  • Denmark
  • Particulate Matter/analysis
  • Soot/analysis

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