Stack Testing

Southwest Ohio Air Quality Agency (Agency) is responsible for observing and validating stack/source tests. These tests are performed to determine the types and amounts of air pollutants emitted from industrial sources. Stack/source tests consist of taking quantitative air samples from exhaust stacks and analyzing these samples to determine pollutant concentrations and mass emission rates. The pollutant emission rate established by a source test must be less than the allowable rate specified in the facility's permit to operate.

Testing serves a two-fold purpose:

(1) To determine compliance with emission rates listed in permits or to establish permit terms and conditions

(2) To set operating parameters for the source and air pollution control equipment.

In addition to stack testing, some emission units are required to operate Continuous Emission Monitors (CEMs) to measure opacity, sulfur dioxides, nitrogen dioxides, oxygen, carbon dioxide, particulates and volatile organic compounds. These CEMS serve to indicate ongoing compliance with permit limits.

Contact Dawn Mays at 513-946-7758 to discuss what methods are appropriate for the source to be tested or to schedule a test date.


Test Contractors
Test Methods
Guidance Documents
Intent to Test Form