Incident assessment values
Accident assessment values ( AEGL for Acute Exposure Guideline Levels ) are specified values for the safety-related dimensioning of accident- relevant process engineering systems of the Accident Ordinance of the Federal Immission Control Act . To plan the security , the civil protection and alarm limits are executed on the basis of AEGL orientation grid.
The AEGL values are toxicologically based maximum mass concentrations for:
- different exposure periods (10 min, 30 min, 1 h, 4 h, 8 h).
- A distinction is made between three so-called effect severity levels:
Use tolerance values
From 1995 to 1996 the then Federal Office for Civil Protection , today's Federal Office for Civil Protection and Disaster Relief (BBK), commissioned the Technical University of Munich with the definition of operational tolerance values (ETW). These were set for a severity and an exposure time of four hours. The ETW serve the emergency organizations as an assessment basis for the definition of the danger area . In areas that are below the ETW, emergency services can work for a period of four hours without respiratory protection without being physically impaired.
In the meantime, the previously determined values are no longer used, but instead the values of the AEGL-2 for an exposure time of four hours.