Emergency Response Planning Guidelines Level

ERPG-1 (AIHA) emergency response planning guideline-level I... 

The Emergency Response Planning Guidelines Level 2 (ERPG-2) concentration for H2S is 20 ppm. This is the maximum airborne concentration below... 

The ERPG-2 (Emergency Response Planning Guidelines Level 2) concentration for H2S is 20 ppm. This is the maximum airborne concentration below which it is believed nearly all individuals could be exposed for up to one hour without experiencing or developing irreversible or other serious health effects or symptoms that could impair an individual s abihty to take protective action. In other words, a healthy woiker should be able to tolerate 20 ppm of H2S for 60 minutes without adverse effects. In practice, most electronic detectors are set for a value of 10 ppm. At this level, workers must evacuate to a safe location immediately. 

AIHA (American Industrial Hygiene Association). 1999. The AIHA 1999 Emergency Response Planning Guidelines and Workplace Environmental Exposure Level Guidelines Handbook. Fairfax, VA AIHA. 

Other means of evaluating the toxic effects of vapors, and their potential impact on exposed people, can be found in the Emergency Response Planning Guidelines for Air Contaminants (ERPGs), issued by the American Industrial Hygiene Association (1992). The documents define values of exposure to toxic vapors needed to produce specific health effects. Three levels of vapor concentration are defined ... 

For illustrative purposes, the hazardous properties of the materials used in the examples have been modeled to the Emergency Response Planning Guideline, ERPG-2 (see Section 3.1.1) concentration for toxic materials, or to one half of the lower flammable limit (LFL/2) for flammable material. Lastly, only the first 3600 seconds of the event are considered in these examples. For an actual situation, different concentration levels for toxic or flammable concentrations may be considered and different durations as well. 

Emergency Response Planning Guidelines (ERPG-time of exposition 1 hour). Value of one-hour maximum concentration of toxic substance in the air in which is possible to expect that almost all individual could not be protected for different severity levels of toxic effects (three severity levels of toxic effects - ERPG 1, 2, 3). (AIHA 1987)... 

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