For toxic industrial chemicals, NARAC products show predicted areas where:
- Near-term health effects may be experienced (calculated using the peak air concentration experienced during any 15-minute period)
- Isolation and protective actions may be warranted, including restricted entry, evacuation, and/or sheltering
- Use of personal protective equipment by emergency workers is recommended
- Explosions may occur due to chemical concentration levels
- Surface contamination may be present
Public exposure guidelines for health effects are based on protective action levels derived from (in the following order of priority):
- AEGLs: 60-minute EPA Acute Emergency Guideline Levels
- ERPGs: AIHA Emergency Response Planning Guidelines
- TEELs: DOE Temporary Emergency Exposure Limits
Exposure calculations assume that individuals remain outdoors in the same location throughout the plume passage.
References:
AEGLs: http://www.epa.gov/oppt/aegl/
TEELs: http://orise.orau.gov/emi/scapa/chem-pacs-teels/default.htm