# The National Emission Ceilings Regulations 2018, Paragraph 4


Evidence that the adjustment is consistent with one or more of the following (with reference made, as appropriate, to relevant previous adjustments)—
(a) new emission source categories—
(i) evidence that the new emission source category is acknowledged in scientific literature or the EMEP/EEA Guidebook;
(ii) evidence that the relevant source category was not included in the relevant historic national emission inventory at the time when the national emission reduction commitment was set (for the purpose of the national emission reduction commitment in Regulation 6(2) the commitment shall be considered as having been set on 4th May 2012);
(iii) evidence that emissions from a new source category contribute to it not being possible to meet a national emission ceiling or national emission reduction commitment, supported by a detailed description of the methodology, data and emission factors used to support that conclusion;
(b) significantly different emission factors used for determining emissions from specific source categories—
(i) a description of the original emission factors, including a detailed description of the scientific basis upon which the emission factor was derived;
(ii) evidence that the original emission factors were used for determining the emission reductions at the time when they were set;
(iii) a description of the updated emission factors, including detailed information on the scientific basis upon which the relevant emission factor was derived;
(iv) a comparison of emission estimates made using the original and the updated emission factors, demonstrating that the change in emission factors contributes to it not being possible to meet a national emission ceiling or national emission reduction commitment;
(v) the rationale for deciding whether the changes in emission factors are significant;
(c) significantly different methodologies used for determining emissions from specific source categories—
(i) a description of the original methodology used, including detailed information on the scientific basis upon which the relevant emission factor was derived;
(ii) evidence that the original methodology was used for determining the national emission ceiling or national emission reduction commitment at the time when they were set;
(iii) a description of the updated methodology used, including a detailed description of the scientific basis or reference upon which it has been derived;
(iv) a comparison of emission estimates made using the original and updated methodologies demonstrating that the change in methodology contributes to it not being possible to meet a national emission ceiling or national emission reduction commitment;
(v) the rationale for deciding whether the change in methodology is significant.

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Source: https://www.legislation.gov.uk/uksi/2018/129/schedule/2/paragraph/4 (the official version)
Page: https://openlegislation.uk/national-emission-ceilings-regulations-2018/schedule-2/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.