text: ISO 22197-1:2007 specifies a test method for the measurement of  removal for materials that contain a photocatalyst or have superficial photocatalytic films.
  Specific FTIR systems are used to characterize photocatalytic activity or passivity, especially with respect to volatile organic compounds, and representative binder matrices.
  Mass spectrometry allows measurement of photocatalytic activity by tracking the decomposition of gaseous pollutants such as nitrogen NOx or