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Combined Exposures to Hydrogen Cyanide and Carbon Monoxide in Army Operations Final Report (2008) / Chapter Skim
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1 Introduction
Pages 8-11

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From page 8...
... Specific attention has been given to the combined effects of simultaneous low-level exposures to CO and HCN because both gases produce similar toxic effects. As a result, the Army prepared a report titled Assessment of Combined Health Effects of Hydrogen Cyanide and Carbon Monoxide at Low Levels for Military Occupational Exposures that provides guidance on assessing combined exposures to low levels of CO and HCN (Bazar 2006)
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From page 9...
... requested that the National Research Council assess (NRC) the Army's proposed guidance for assessing the adverse effects resulting from the combined simultaneous exposures to low levels of CO and HCN in weaponized armored vehicles.
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From page 10...
... The ad hoc committee will specifically determine the following in its first report: Does the hazard presented from combined exposure to HCN and CO at low levels warrant their combined assessment or is the individual assessment of each chemical sufficiently protective and, if the combined exposure assessment of HCN and CO is warranted at low levels, is the hazard quotient approach, discussed in the Army's technical context section, a reasonable method of as sessment? Should it be modified or improved (that is, the use of a blood HCN benchmark instead of the ACGIH TLV-C1)
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From page 11...
... Therefore, the committee concluded that until further findings suggest otherwise, the Army's use of the HQ approach or hazard index is reasonable in establishing exposure limits for personnel simultaneously exposed to CO and HCN. The committee stated that the HQ should be used for calculating the risk of adverse effects from exposure to CO and HCN combined.
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Key Terms

  • toxic effects
  • carbon monoxide
  • cfk equation
  • proposed guidance
  • combined exposure

  • initial report
  • air concentrations
  • hydrogen cyanide
  • armored vehicles
  • blood hcn

  • health hazard
  • threshold limit
  • hcn concentrations
  • cohb levels
  • limit value

  • partial pressure
  • additive effects
  • hcn combined
  • combined effects
  • sessing combined

  • assessing combined
  • combined health
  • spiking levels
  • current acgih
  • suggest otherwise

  • army test
  • recommends studies
  • various operational
  • inhaled air
  • health hazards


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