# Commission Regulation (EU) No 601/2012 of 21 June 2012 on the monitoring and reporting of greenhouse gas emissions pursuant to Directive 2003/87/EC of the European Parliament and of the Council (Text with EEA relevance) (repealed), Division 1: Tier definitions for measurement-based methodologies

Extent: E+W+S+N.I.

Measurement-based methodologies shall be approved in accordance with tiers with the following maximum permissible uncertainties for the annual average hourly emissions calculated in accordance with Equation 2 set out in section 3 of this Annex.
Table 1
Tiers for CEMS (maximum permissible uncertainty for each tier)
Tier 1
Tier 2
Tier 3
Tier 4
CO2 emission sources
± 10 %
± 7,5 %
± 5 %
± 2,5 %
N2O emission sources
± 10 %
± 7,5 %
± 5 %
N.A.
CO2 transfer
± 10 %
± 7,5 %
± 5 %
± 2,5 %

---
Source: https://www.legislation.gov.uk/eur/2012/601/annex/VIII/division/1 (the official version)
Page: https://openlegislation.uk/eu-regulation-2012-601/annex-VIII/division-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.