HHE Report, No. HETA-81-388-1129, Santa Cruz Metropolitan Transit District, Santa Cruz, California.
NIOSH 1982 Jun:18 pages
Exposures to diesel and gasoline exhaust fumes were investigated on August 19 and 20, 1981. The survey was requested by the vehicle maintenance supervisor for the Santa Cruz Metropolitan Transit District (SIC-4172). Fourteen workers are employed in vehicle maintenance. They reported dizziness, headaches and nausea. During diesel servicing, carbon-monoxide (630080) (CO) concentrations peaked at 8 parts per million (ppm), well below the NIOSH criteria of 35ppm. Carbon-dioxide (124389), nitrogen-dioxide (10102440), and sulfur-dioxide (7446095) were either below detection limits or barely detectable. Total particulate concentrations peaked at 1.12 milligrams per cubic meter (mg/m3) (the NIOSH criteria for nuisance dust is 10mg/m3). Formaldehyde (50000) concentrations peaked at 1.4ppm. During gasoline bus startup, peak CO concentrations did not exceed the NIOSH recommended time weighted average of 35ppm. Reported symptoms were consistent with exposure to diesel and gasoline fume exhaust, and formaldehyde exposure. The authors conclude that workers were not overexposed to airborne pollutants except formaldehyde. Significant short term exposure to formaldehyde occurred depending on job task, the time of the shift, and the mechanical condition of the bus. The authors recommend various steps to reduce diesel exhaust fume exposure.
NIOSH-Author; NIOSH-Health-Hazard-Evaluation; Hazards-Unconfirmed; Occupational-exposure; Chronic-exposure; Diesel-exhausts; Transportation-workers; HETA-81-388-1129; NIOSH-Technical-Assistance-Report;
630-08-0; 124-38-9; 10102-44-0; 7446-09-5; 50-00-0;
Hazard Evaluation and Technical Assistance; Field Studies
NTIS Accession No.
Hazard Evaluations and Technical Assistance Branch, NIOSH, Cincinnati, Ohio, 18 pages, 12 references