Safety usually associated with acute associated with acute injuries, short injuries, short-term, term, traumatic exposures traumatic exposures

Health usually directed at chronic exposures, persistent, prolonged, repeated


Industrial Hygiene Industrial Hygiene - "that science and art devoted to the anticipation, recognition, evaluation, and control of those environmental factors or stresses, arising in or from the workplace, which may cause sickness, impaired health and well-being, or significant discomfort, and inefficiency among workers or among the citizens of the community"

  • Chemical environmental concentrations

  • Physical noise, heat, ionizing, etc. noise, heat, ionizing, etc.

  • Ergonomic -man-machine interface machine interface

  • Biological- micro living organisms

States of Matter

  • Solids definite shape and volume

  • Liquids definite volume but no definite shape

  • Gases neither definite volume nor shape

Chemical Stresses Chart (available in full paper).

Chemical Stresses

  • Dusts solid particles from handling, grinding, crushing, impact (1 grinding, crushing, impact (1–25 microns) 25 microns) (cotton, grain, grinding wheels) (cotton, grain, grinding wheels)

  • Smoke- carbon or soot particles less than carbon or soot particles less than .1 microns in size and are the products of .1 microns in size and are the products of incomplete combustion (fire, gas incomplete combustion (fire, gas engines)

  • Fumes solid particles generated by solid particles generated by condensation from the gaseous state condensation (welding, soldering, brazing)

  • Aerosols solid particles or liquid droplets of fine enough size to remain fine enough size to remain dispersed in air for a prolonged period of time (powder sprays, paint of time)

  • Mists suspended liquid droplets generated by condensation of liquids, or by breaking up a liquid into a dispersed by breaking up a liquid state (mixing vats, maintenance state (mixing vats, maintenance degreasers)

  • Vapors volatile form of a substance normally a liquid or solid at STP(paint thinners, nail polish thinners, nail polish remover)

Terms to Express

  • TLV threshold limit value threshold limit value - airborne concentration under which it is believed that nearly all workers may be repeatedly exposed day after day without adverse effect (ACGIH)

  • PEL permissible exposure limit permissible exposure limit (OSHA)

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