Air discharge emission control systems may include high velocity extraction systems (up to 300,000 cfm), large particulate material drop out boxes, cyclones, z-boxes, wet and dry venturi scrubbers, thermal oxidizers, acid gas scrubbers, baghouses, and associated water treatment systems for wet venturi scrubbers and acid gas scrubbers. Physical Activities Required to Perform Essential Functions: Ability to lift and carry up to 20 pounds frequently, and up to 50 pounds occasionally; be mobile within an office and field environment; operate an automobile; ability to travel frequently by auto or airplane to local and regional locations; climb; negotiate uneven surfaces; sit, stand, and/or walk for extended periods of time; and keyboard for up to several hours per day.