PGVP Audit Results

In collaboration with the National Institute of Standards and Technology (NIST), EPA tested the EPA protocol gases used to calibrate continuous emission monitoring systems (CEMS) and the instruments used in EPA reference methods. The following Protocol Gas Verification Program (PGVP) Audit reports are available. 

• 2010 EPA Protocol Gas Audit (pdf) (659.79 KB)  (released 1/13/2011)
• 2013 EPA Protocol Gas Audit (pdf) (2.86 MB)  (released 4/21/2015)
• 2015 EPA Protocol Gas Audit (pdf) (685.04 KB) (released 7/27/2022)
• 2018 EPA Protocol Gas Audit (pdf) (1.13 MB) . (released 12/23/2020)