Over time, these effects may occur with exposure to smaller and smaller amounts of the chemical, but will disappear soon after the exposure stops. For reasons not fully understood, not everyone exposed to a sensitizer will experience this reaction. Examples of sensitizers include epoxy resins, nickel salts, isocyanates and formaldehyde. Further information about working with Particularly Hazardous Substances is outlined in Particularly Hazardous Substances . 5.5 Chemical Exposure Determination OSHA establishes exposure limits for several hundred substances.
PELs refer to airborne concentrations of substances averaged over an eight-hour day.
This information is also available in the OSHA Table Z list of regulated chemicals. EHS and the principal investigator or supervisor may use professional judgement, based on the information available about the hazards of the substance and the available control measures, to determine whether exposure monitoring must be conducted. When necessary, exposure monitoring is conducted by EHS according to established industrial hygiene practices. Results of the monitoring are made available to the individual monitored, his or her supervisor, and the departmental Chemical Hygiene Officer within 15 working days of the receipt of analytical results. Based on the monitoring results, periodic air sampling may be scheduled at the discretion of EHS, in accordance with applicable federal, state and local regulations.