Excursion limit

Excursion limit A time-weighted average of pollutant exposure over a length of time specified by OSHA that cannot be exceeded during the working day. See Peak limit. 

The PELs are promulgated by OSHA and have force of law. These levels are similar to the ACGIH criteria for TLV-TWAs because they are also based on 8-hr time-weighted average exposures. OSHA-cited acceptable ceiling concentrations, excursion limits, or action levels may be appropriate for use as benchmarks. 

Carcinogen Category (proposed) Excursion Limit Recommendation... 

Excursion limit (El) 1.0 f/cc as averaged over a sampling period of 30 minutes. 

OSHA regulations also establish an action level 0.1 f/cc for an 8 hour TWA. Employee training is required once an action level of 0.1 f/cc and/or the excursion limit is reached. 

OSHA also requires medical examinations under its General Industry Standard for any employee exposed to fiber levels in the air at or above the OSHA action level (0.1 f/cc) and/or the excursion limit (1.0 f/cc). In both cases - the action level and excursion limit - the OSHA medical examination requirement applies if the exposure occurs for at least one day per year. 

The 2003 ACGIH threshold limit valuetime-weighted average (TLV-TWA) for allyl alcohol is 2 ppm (4.8mg/m ) with a short-term excursion limit of 4ppm (9.5mg/m ) and a notation for skin absorption. 

The 2003 short-term excursion limit (STEL)/ceiling limit for hexylene glycol is 25 ppm (125 mg/m ). 

The 2003 AGGIE threshold limit value-time-weighted average (TEV-TWA) is 50 ppm (238mg/m ) with a short-term excursion limit (STEE)/ceiling of 75ppm (356mg/m ). 

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