Monitoring stack emissions: techniques and standards for periodic monitoring
This index will help you choose an appropriate periodic monitoring technique and standard for monitoring stack emissions to air (formerly part of M2).
Documents
Details
We have structured this index to help you choose an appropriate periodic monitoring technique and standard. It was formerly part of the M2 guidance document.
Standards may contain various options and approaches.
We have produced method implementation documents (MIDs) for several standards to make sure they are applied consistently.
If a MID has been produced we have included it in the index, next to the relevant standard.
Substances are listed in alphabetical order.
Updates to this page
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Updates to the monitoring standards for carbon disulfide, carbonyl sulfide, formaldehyde, mercury and metals. Added monitoring methods for per and polyfluorinated alkyl substances and volatile fluorinated compounds.
Update history
2026-07-02 14:18
Added method for brominated flame retardants.Clarified use of alternative analyser techniques within standard reference methods.Removed guidance on determining hexavalent chromium in fine particulate matter.Deleted use of mass spectrometry for halogens and halides.Added lithium to scope of metals that can be measured using EN 14385.
2025-05-12 15:35
Updates to the monitoring standards for carbon disulfide, carbonyl sulfide, formaldehyde, mercury and metals. Added monitoring methods for per and polyfluorinated alkyl substances and volatile fluorinated compounds.
2022-11-17 14:09
Updated the monitoring standards for bioaerosols, carbon dioxide, hydrogen fluoride and nitric acid vapour to remove out of date standards.