Horizon performs all recognized Reference Methods for criteria and non-criteria pollutants from virtually every type of industrial source.

When approved test methods or sampling protocols do not exist, as for specific air toxic or source-specific pollutants, Horizon has developed and validated modified test methods (with formal Agency approval). Horizon’s unique testing capabilities are the result of our staff’s ability and willingness to tackle special testing requirements. For example, Horizon is the only organization certified to perform barbecue ignition product compliance testing for SCAQMD, CARB and EPA certification.