As
a quasi-judicial body, it assumes the powers and functions
of the former National Pollution Control Commission with
respect to the adjudication of pollution cases under Republic
Act 3931 (Pollution Control Law) and Presidential Decree
984 (National Pollution Control Decree of 1976). Its function
was further expanded by the enactment of the Clean Water
Act of 2004 (RA9275) and the Clean Air Act (RA 8749).