Hazardous Mataterial - Recognizing and Identifying the Hazards No. 1 Questions taken from Jones & Bartlett Fundamentals of Fire Fighter Skills (3rd Edition) Progress Indicator: Question 5 of 20 5.  Which term references the maximum concentration in air below which it is believed nearly all individual could be exposed without experiencing irreversible health effects that could impair their abilities to take protective action? p. 517 Choices: TEEL-2 TEEL-1 TEEL-0 TEEL-3