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HHE Determination Report No. HHE-79-105-1, ASARCO Mission Unit Mine, Sahuarita, Arizona.
Morgantown, WV: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, HHE-79-105-1, 1982 Feb; :1-5
Heat stress among heavy equipment operators (SIC-3532) at near Sahuarita, Arizona was investigated by NIOSH in 1979. NIOSH investigators rode in the operator cabs of heavy equipment vehicles and measured wet bulb temperature (WBT) with a Botsball. Wet globe bulb temperature (WGBT) were calculated directly from WBT. over a 5 day period 524 measurements were taken in five types of vehicles. Relative humidity was below 50 percent and the ambient air temperature ranged from 27.8 to 42.8 degrees C. None of the measurements approached the WGBT threshold limiting value of 30 degrees C. Ninety percent of the measurements were below the NIOSH WGBT action level of 26 degrees C. NIOSH concluded that no heat stress hazard existed for the heavy equipment operators given the moderate conditions of relative humidity.
NIOSH-Author; HHE-79-105-1; NIOSH-Health-Hazard-Evaluation; Hazards-Unconfirmed; Region-9; Health-surveys; Heat-stress; Heat-exposure
Field Studies; Hazard Evaluation and Technical Assistance
NTIS Accession No.
National Institute for Occupational Safety and Health
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division