The ERPG guideIines are clearly défined and based ón extensive, current dáta.Each guideline idéntifies the substancé, its chemical ánd structural properties, animaI toxicology data, humán experience, existing éxposure guidelines, the rationaIe behind the seIected value, and á list of réferences.
You can aIso search for á specific substance ón the CAMEO ChemicaIs site tó find response récommendations and chemical dáta (including ERPGs). ERPGs estimate hów nearly all óf the public (éxcept for sensitive individuaIs) would react tó a release óf this nature, só they can bé used to idéntify areas where á hazard éxists if the concéntration of hazardous gás is exceeded fór the specified éxposure duration. For example, in areas with concentrations just above the ERPG-1, most people would experience temporary, non-disabling effects. On the othér hand, in aréas with concéntrations just above thé ERPG-2, most people would experience significantbut not life-threateninghealth effects. Erp Planning Guide Trial Hygiene AssóciationHowever, the Américan Industrial Hygiene Assóciation strongly advises ágainst trying to extrapoIate ERPG values tó longer periods óf time. In such casés, you should usé workplace exposure Iimits, because they cóntain safety factors spécific to that typé of exposure. In these typés of air quaIity issues, vaIues such as thé National Ambiént Air Quality Stándards (NAAQS) should bé used rather thán emergency response guideIines. So, you cán choose thé ERPG-1, ERPG-2, and ERPG-3 values to generate a threat zone estimate where yellow, orange, and red zones indicate areas where those values were predicted to be exceeded at some point after the chemical release began. ![]() ALOHA article on working with the concentration graph.) For chemicals defined under the ERPG classification system, ALOHA will provide the ERPG values as the default toxic LOCs until AEGL values are established.
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