2 Pesticide Risk Assessment NOAEL:EPA scientists examine the results of tests exposing laboratory animals to various doses of a pesticide. The highest dose which caused no observable harm or side effects is the No-Observable Adverse Effect Level or NOAEL. 08i OSU regonPesticide Risk Assessment • NOAEL: EPA scientists examine the results of tests exposing laboratory animals to various doses of a pesticide. • The highest dose which caused no observable harm or side effects is the No-Observable Adverse Effect Level or NOAEL