4.7 Article

Atmospheric dispersion of PCB from a contaminated Lake Michigan harbor

Journal

ATMOSPHERIC ENVIRONMENT
Volume 122, Issue -, Pages 791-798

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2015.10.040

Keywords

Polychlorinated Biphenyls (PCBs); AERMOD; Weather Research and Forecasting Model (WRF); Indiana Harbor and Ship Canal (IHSC); 4-monochlorobiphenyl (PCB3)

Funding

  1. Iowa Superfund Research Program
  2. NIEHS [P42ES013661]
  3. National Center for Research Resources, NIH [UL1RR024979]

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Indiana Harbor and Ship Canal (IHSC) in East Chicago is an industrial waterway on Lake Michigan and a source of PCBs to Lake Michigan and the overlying air. We hypothesized that IHSC is an important source of airborne PCBs to surrounding communities. We used AERMOD to model hourly PCB concentrations, utilizing emission fluxes from a prior study and hourly meteorology provided by the State of Indiana. We also assessed dispersion using hourly observed meteorology from a local airport and high resolution profiles simulated by the Weather Research and Forecasting model. We found that emissions from IHSC waters contributed about 15% of the observed Sigma PCB concentrations close to IHSC when compared on an hourly basis and about 10% of observed annual concentrations at a nearby school. Concentrations at the school due to emissions from IHSC ranged from 0 to 18,000 pg m(-3), up to 20 times higher than observed background levels, with an annual geometric mean (GSD) of 19 (31) pg m(-3). Our findings indicate that IHSC is an important source of PCBs to East Chicago, but not the only source. Four observed enriched PCB3 samples suggest a nearby non-Aroclor source. (C) 2015 Elsevier Ltd. All rights reserved.

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