Human Health Benefits from Fish Consumption vs. Risks from Inhalation Exposures Associated with Contaminated Sediment...

Area of Science:

• Environmental Science
• Public Health
• Risk Assessment

Background:

• Environmental dredging (ED) is a costly remediation strategy for contaminated sediments, aiming to reduce human health risks.
• However, ED operations can introduce unforeseen health risks, potentially negating the intended benefits.

Purpose of the Study:

• To quantitatively assess the population health benefits and risks associated with ED.
• To evaluate the net health impact of ED using the Hudson River PCB Superfund Site as a case study.

Main Methods:

• Compared three remediation scenarios: No Action (NA), Source Control (SC), and ED.
• Quantified health benefits from reduced PCB levels in fish and health risks from inhalation exposures (PCBs, particulate matter) using disability-adjusted life years (DALYs).
• Incorporated Monte Carlo simulations for uncertainty analysis and considered occupational health risks.

Main Results:

• ED resulted in an estimated reduction of 15 DALYs compared to SC, but ED operations induced a burden of 33 DALYs, primarily from particulate matter emissions.
• The net health benefit of ED ranged from a loss of 11 DALYs to a gain of 10 DALYs, with a median of 0 DALYs avoided.
• The study highlights significant uncertainties and differing affected populations for benefits and risks.

Conclusions:

• Environmental dredging in the Hudson River may not have yielded a net positive human health impact.
• Minimizing long-distance transport of dredged sediment is crucial for reducing associated health risks.
• A comparative approach can improve remediation design to maximize benefits and minimize risks.