Chlorine exposure during a biological decontamination study in a mock subway tunnel.

The Underground Transport Restoration (UTR) Operational Technology Demonstration (OTD) was a full-scale field study focused on remediation of a subway system after contamination with a surrogate (, subspecies []). The study involved all aspects of subway system remediation following contamination with a biological surrogate, including characterization, clearance sampling, and waste management. Personal exposure to chlorine gas was also monitored throughout the decontamination portion of the study.

Assessing exposure to crystalline silica from farm work: a population-based study in the Southeastern United States.

Purpose: Farm workers are exposed to crystalline silica, but there are no established questionnaires to assess silica dust exposure from farm work in epidemiologic studies. This study examines aspects of farm work that were used to estimate potential silica dust exposure in a population-based study conducted in the southeastern United States.

Methods: We collected work and farming histories through in-person interviews with 620 participants in a population-based case-control study of systemic lupus erythematosus.

Exposure to respirable crystalline silica in eastern North Carolina farm workers.

Occupational exposure to crystalline silica has been linked to silicosis, some forms of cancer, and certain autoimmune diseases. Little information exists on exposure levels of respirable silica in the agricultural industry. This study assessed respirable silica exposure of farm workers in eastern North Carolina.