Air quality testing

A division of


Used for United States EPA (40 CFR 60 App.A Meth.25) Method 25 emissions testing. "Determination of Total Gaseous Non-methane Organic Emissions as Carbon". The dry ice is encased around a sample "trap" during each one hour run. The trap is preserved on dry ice until it reaches the laboratory for analysis. It is not uncommon to purchase at least 200 lbs of dry ice for a 3 run test series performed on a 1200 F incinerator exhaust stack on a hot August day in Florida. This is why so many stack testers use Many are on the road and need a reference source to dry ice vendors all over the U.S. For a professionally illustrated schematic of Method 25 and other USEPA emissions test methods visit: