Sweden’s emissions of greenhouse gases and air pollutants from stationary combustion, reported to among others UNFCC and CLRTAP, are in most cases calculated from fuel amounts and calorific values from Swedish energy statistics, and emission factors developed by SMED.

During autumn 2021 and spring 2022, several projects with the purpose to revise and update certain emission factors for stationary combustion have been conducted. The results on these projects (UF-27 Updates of certain emissions factors for stationary combustion, UF-31 Revision of certain emission factors for stationary combustion – stage 2 and parts of UF-07 Updates of emission factors for pulp and paper industry NFR 2H1) have been summarized in the current report.

The most significant effect of the revision of emission factors is seen for emissions of dioxin in NFR 1A1 and 1A2, where the annual average decrease would account to 65 % and 80%, respectively. Large effects are also seen for emissions of N₂O in CRF 1A4, where the average decrease was 35 %, and for NH₃ emissions in NFR 1A1 with an average increase of 10 %. Certain effects on the biogenic CO₂ emissions are also seen, with an average increase of 6 % to 9 % in NFR 1A1, 1A2 and 1A4. Emissions of SO₂ decrease on average with 3 % to 8 % for NFR 1A1, 1A2 and 1A4, while corresponding decrease for CO was between 4 % and 6% for the same NFR codes. Zink emissions in NFR 1A1 had an average decrease of 5 %. The effect on other emissions is relatively small, under ±5 % in average change of emissions. 

As a result of the projects UF-27, UF-31 and parts of UF-07 the following revisions are proposed:

• Emissions factor for biogenic CO₂ from combustion of black liquor from 96 kg/GJ is suggested to be 105 kg/GJ,
• Revisions of emission factors for CO₂ and wood fuels, pine and pitch oil and other biomass within stationary combustion (CRF/NFR 1A1, 1A3, and 1A4),
• Emission factor for dioxin from combustion of wood fuels, peat and other biomass is suggested to be revised,
• Emission factors for other fuel categories are suggested to be revised,
• All recommendations of revised emission factors with the reference of “SEPA 1995”,
• Revision of emission factors updated in the EMEP/EEA Guidebook 2019.