HHE Report No. HETA-90-088-2110, Yellow Freight System, Inc., Columbus, Ohio, Maybrook, New York.
Zaebst-DD; Cooper-TC; Stern-FB; Heitbrink-WA
NIOSH 1990 May:102 pages
In response to a request from the Yellow Freight Systems, Inc. (SIC- 4213) an evaluation was made of the effectiveness of two techniques for controlling the exposures of dockworkers to exhaust emissions from diesel powered forklift trucks. These two techniques were retrofitting diesel towmotors with high temperature exhaust filtration units, and the use of overhead exhaust fans located in the ceiling of the dock. Surveys were conducted at facilities in Columbus, Ohio and Maybrook, New York. The exposure to submicrometer elemental carbon (1333864) during use of propane engines was 0.9 micrograms/cubic meter (microg/m3), significantly lower than during the use of filtered diesel engines (1.9microg/m3) and this was significantly lower than during the use of unfiltered diesel engines (24microg/m3). Concentrations of other chemical components measured and airborne mutagenicity in two dock areas indicated no significant changes. Most respiratory and other acute symptoms in workers were significantly reduced when diesel powered towmotors were substituted with either propane powered towmotors or with diesel powered towmotors fitted with the exhaust filtration units. The instillation of 12 roof exhaust fans was not effective in reducing exposures to diesel exhaust. The authors conclude that use of propane or filtered diesel towmotors significantly reduced particulate exposures, while roof exhaust fans were not effective. The authors recommend measures to aid in controlling vehicle emissions.
NIOSH-Author; NIOSH-Health-Hazard-Evaluation; NIOSH-Technical-Assistance-Report; HETA-90-088-2110; Hazard-Confirmed; Region-2; Region-5; Diesel-exhausts; Air-quality-control; Ventilation-systems;
Hazard Evaluation and Technical Assistance;
NTIS Accession No.
Hazard Evaluations and Technical Assistance Branch, NIOSH, U.S. Department of Health and Human Services, Cincinnati, Ohio, Report No. HETA-90-088-2110, 102 pages, 37 references