Sigma Aldrich ceased providing samples for the Stationary Source Audit Sample (SSAS) program in May of 2019.
From the Air Emission Measurement Center’s website (EMC):
“Since there are no longer two providers, the requirement to obtain these audit samples is no longer in effect until such time as another independent AASP has audit samples available for purchase.”
While the EPA cannot require source testers to use audit samples, CLN recommends that audit samples still be used. Currently, the only accredited provider of SSAS audit samples is ERA.
Note: Chester LabNet is not affiliated in any way with ERA, and does not endorse or otherwise warrant the performance, prices, or quality of their audit samples. Neither does CLN act as an agent of or receive any referral fees from them.