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general:projections:recalculations [2025/04/03 21:01] – eisoldgeneral:projections:recalculations [2025/04/03 21:20] (current) – eisold
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 ===== Recalculations ===== ===== Recalculations =====
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 Due to recalculations in each underlying emission inventory submission, all calculations of emission reduction potentials in the WM and WAM scenario of the respective projection are regularly updated. Furthermore, additional measures that had been included in the WAM scenario in the previous projection can become part of the WM scenario in the current projection, as they were put into force in the meantime (e. g. amendment of the 17<sup>th</sup> BImSchV). In addition, updated GHG emission projections using most recent projections of economic and other parameters result in a new projection of activity rates that needs to be considered for updating the emission projections of air pollutants. For the regular update of the projections under NEC-Directive (EU) 2016/2284, in between the regular update of the National Air Pollution Control Programme every four years, remaining measures in the WAM scenario of the current NAPCP stay and their mitigation potential is reassessed, unless they were dropped by the current federal government. The last is the case for the package of additional agricultural measures in the WAM scenario of the German NAPCP 2023. Thus, it was not reassessed for the current projections. Due to recalculations in each underlying emission inventory submission, all calculations of emission reduction potentials in the WM and WAM scenario of the respective projection are regularly updated. Furthermore, additional measures that had been included in the WAM scenario in the previous projection can become part of the WM scenario in the current projection, as they were put into force in the meantime (e. g. amendment of the 17<sup>th</sup> BImSchV). In addition, updated GHG emission projections using most recent projections of economic and other parameters result in a new projection of activity rates that needs to be considered for updating the emission projections of air pollutants. For the regular update of the projections under NEC-Directive (EU) 2016/2284, in between the regular update of the National Air Pollution Control Programme every four years, remaining measures in the WAM scenario of the current NAPCP stay and their mitigation potential is reassessed, unless they were dropped by the current federal government. The last is the case for the package of additional agricultural measures in the WAM scenario of the German NAPCP 2023. Thus, it was not reassessed for the current projections.
  
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 {{:general:projections:nox_recalculations_2025.png?|}} {{:general:projections:nox_recalculations_2025.png?|}}
  
-In general there is also not much change in the current projection for **SO<sub>X</sub>**, that needs further explanation. There is only one relevant reason for differences between the current WM projection and the previous WM projection of the NAPCP 2023:+There is also not much change in the current projection for **SO<sub>X</sub>**, that needs further explanation. There is only one relevant reason for differences between the current WM projection and the previous WM projection of the NAPCP 2023:
     * The coal phase-out until 2030 is now included in the WM projection. To some extent because of legislation that did take place in the meantime and to some extent because of updated assumptions on price development of fuels, prices at the energy market as well as for CO<sub>2</sub>-prices, making especially the power generation from lignite in the remaining capacities less and less economical. In the WM scenario of the NAPCP 2023 this was assumed to take place until 2038 (see description of the previous WM scenario in the IIR 2024).     * The coal phase-out until 2030 is now included in the WM projection. To some extent because of legislation that did take place in the meantime and to some extent because of updated assumptions on price development of fuels, prices at the energy market as well as for CO<sub>2</sub>-prices, making especially the power generation from lignite in the remaining capacities less and less economical. In the WM scenario of the NAPCP 2023 this was assumed to take place until 2038 (see description of the previous WM scenario in the IIR 2024).
  
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 {{:general:projections:nmvoc_recalculations_2025.png?|}} {{:general:projections:nmvoc_recalculations_2025.png?|}}
  
-Submission 2021 contained recalculations of NH<sub>3</sub> emissions in historic years mainly because of introducing dairy heifers (dairy and slaughter heifers are now treated separately in the inventory) and a methodological change in emission calculations for inorganic fertilisers, leading to significantly lower emissions and less variation from one year to another((for further explanation see: https://iir.umweltbundesamt.de/2021/general/recalculations/ammonia)). This is the main reason that emission projections of the draft NAPCP 2023 are systematically lower than former projections. As a result, absolute emissions to be reached in 2020 and 2030 following the relative reduction commitments are lower than before. Despite a similar trend in the current emission projections compared to 2021 WAM projection, assumptions of reduction potentials of WM and WAM measures are more conservative now, but compensated by assuming further decreases in animal numbers, especially cattle. This is further explained in the draft NAPCP 2023.+For ammonia (**NH<sub>3</sub>**) two comparisons to previous projections are shown as two WM projections were submitted under NEC-Directive & CLRTAP in 2025, one based on inventory submission 2024 and the other one based on inventory submission 2025 under otherwise identical assumptions. In both cases, from submission 2021 onwards a methodological change in emission calculations for inorganic fertilisers is leading to less variation from one year to another((for further explanation see: https://iir.umweltbundesamt.de/2021/general/recalculations/ammonia)). Apart from that, current WM projection based on inventory submission 2024 is slightly above the previous WM and WAM scenarios of the NAPCP 2023 in 2030 and beyond as there are slight changes in the assumptions on animal numbers and thus, in the amount of manure and inorganic fertilisers applicated. The current WM projection based on inventory submission 2025 is significantly higher, due to recalculations in the inventory. The main reason for higher emissions are adjusted emission factors for various inorganic fertilisers according to the latest EMEP/EEA air pollutant emission inventory guidebook 2023. Development of historic emissions and projections in the current WM scenario (in both variations) is not parallel, as the amount of fertilisers is multiplied with the emission factors and therefore difference in resulting emissions is not linear. 
  
 {{:general:projections:nh3_recalculations_2025_sub2024.png?|}} {{:general:projections:nh3_recalculations_2025_sub2024.png?|}}
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 {{:general:projections:nh3_recalculations_2025_sub2025.png?|}} {{:general:projections:nh3_recalculations_2025_sub2025.png?|}}
  
-Differences in current projections of fine PM emissions (PM<sub>2.5</sub>) are a consequence of many factors.+**PM<sub>2.5</sub>** projections are mostly consistent over the various projection reportings. However, the projection of the NAPCP 2019 and later projections are containing mutually compensating assumptions. The WAM scenario of the NAPCP 2019 had assumed a much higher coal use as well as a much lower use of solid biomass in 2030 than the following projections, leading to an almost congruent estimate of the projected national PM<sub>2.5</sub> total. Thus, the WM scenario of the NAPCP 2023 lies above all other displayed scenarios, because of higher biomass use than in the WAM scenario of the NAPCP 2019 (and also than in the current WM and WAM scenarios) in combination with a lower coal use than in the NAPCP 2019. 
  
-First, recalculations took place in submission 2021 in sector 2.G in the use of fireworks and the use of tobacco((see https://iir.umweltbundesamt.de/2021/general/recalculations/pm2.5)) and in submission 2022 in 1.A.3.d. ii (national navigation)((see https://iir.umweltbundesamt.de/2022/sector/energy/fuel_combustion/transport/navigation/national_navigation)) leading to lower PM<sub>2.5</sub> emissions over all historic years compared to submission 2020. The change in 2005 results in lower absolute emissions to be reached in 2020 and 2030 regarding the relative emission reduction commitments compared to the 2021 projections and further in systematically lower projections based on submission 2022 compared to 2021 projections. Still, the WM scenario of the draft NAPCP 2023 is above the WAM scenario of the NAPCP 2019 because of the same reason as in 2021 projection (more conservative methodology to project activity rates in certain industrial sectors)((for further explanation see https://iir.umweltbundesamt.de/2021/general/projections/recalculations)). Finally, the current WAM scenario is compliant with the emission reduction commitment in 2030 due to additional emission reductions through the accelerated coal phase-out by 2030 and the road transport package. Increasing emissions in the building sector due to a projected increase in biomass use can be compensated by additional measures to further reduce the implied emission factors of small combustion installations burning woody biomass. However, if looking at the year 2020 of submission 2022 current WM and WAM scenario are quite conservative due to conservative assumptions over almost all sectors.+However, the assumed coal use in the current WM scenario is almost phased out until 2030 (see description in the [[General:Projections:wm-scenario| WM scenario]]) in combination with an assumed use of solid biomass that is lower than in the NAPCP 2023 but higher than in the NAPCP 2019. That the WAM scenario of the NAPCP 2023 is also slightly above the current WM projection in the year 2025 is mostly due to a previously projected sharper increase in the use of solid biomass in the building sector than under updated assumptions. Apart from these differing assumptions of coal use in the energy and industry sector and the use of solid biomass in the building sector as well as in the energy and industry sector, also updated assumptions in the road transport sector have a mitigation effect (e. g. Euro 7 regulation introducing limit values for tyre and brake wear). With less biomass in the current WM scenario than in the NAPCP 2023 also the mitigation potential of the revision of the Ecodesign directives for solid fuel boilers and solid fuel local space heaters in the current [[General:Projections:wam-scenario| WAM scenario]] is slightly lower than in the previous WAM scenario of the NAPCP 2023.
  
 {{:general:projections:pm2-5_recalculations_2025.png?|}} {{:general:projections:pm2-5_recalculations_2025.png?|}}