exposure.An AEGL-1 is the concentration above which results in discomfort, irritation, or certain asymptomatic nonsensory effects, which are not disabling and are transient and reversible upon cessation of exposure. AEGL-2 is the concentration above which irreversible or other serious, long-lasting adverse health effects occur ormay cause an impaired ability to escape. AEGL-3 is the concentration above which life-threatening health effects or death may occur.