New Star Environmental is the only manufacturer of the classic Andersen flat plate in-stack impactor for particle measurement in industrial smoke stacks. Also known as the Mark III, this source particle sizing impactor is the clear leader in this highly regulated segment of air pollution control. Typically used downstream of air pollution control equipment, source particle sizing impactors are ideal for sizing particles in industrial smoke stacks in conjunction with the with U.S. Environmental Protection Agency (EPA) Method 5 isokinetic stack equipment.