# The Environmental Authorisations (Scotland) Regulations 2018, Paragraph 43


(1) Average emission limit values (mg/Nm3) for SO2 for multi-fuel firing combustion plants within a refinery, with the exception of gas turbines and gas engines, which use the distillation and conversion residues from the refining of crude-oil for own consumption, alone or with other fuels—
(a) for combustion plants which were granted a permit before 27 November 2002 or the operators of which had submitted a complete application for a permit before that date, provided that the plant was put into operation no later than 27 November 2003 is 1000 mg/Nm3,
(b) for other combustion plants: 600 mg/Nm3.
(2) These emission limit values are to be calculated at—
(a) a temperature of 273.15K,
(b) a pressure of 101.3kPa,
(c) after correction for the water vapour content of the waste gases and
(d) at a standardised O2 content of—
(i) 6% for solid fuels,
(ii) 3% for liquid and gaseous fuels.

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Source: https://www.legislation.gov.uk/ssi/2018/219/schedule/21/paragraph/43 (the official version)
Page: https://openlegislation.uk/environmental-authorisations-scotland-regulations-2018/schedule-21/paragraph-43
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.