What Changes in Version 2.1 and Why It Matters
The February 2026 update of the MRV non CO2 data collection Guidance introduces important refinements that move the framework from concept to operational clarity. While the core regulatory structure remains aligned with the amended Monitoring and Reporting Regulation, the latest version strengthens practical implementation, especially through clearer data rules and the evolution of NEATS.
According to the updated Guidance Version 2.1, February 2026, the focus is now firmly on standardising data inputs, improving fuel property handling, and preparing operators for full scope reporting from 2027 onward.
Clearer Scope and Transitional Flexibility
One key change is the reinforced clarification of geographic scope for 2025 and 2026. The reduced scope applies mainly to intra EEA routes and selected EEA to UK and Switzerland flights, easing the transition phase before full inbound and outbound coverage from 2027.
This staged approach gives operators time to adapt systems, monitoring plans and internal workflows without immediate exposure to full operational complexity.
Stronger Emphasis on Primary Data
The updated Guidance places greater emphasis on the strategic value of Primary data. While operators may rely fully on Secondary data via NEATS, the document now clearly highlights that default values can lead to higher calculated non CO2 effects.
More detailed descriptions are provided for:
- Flight trajectory resolution requirements
- Engine efficiency and fuel flow consistency
- Aircraft mass and load factor inputs
- Correlation between flight information and uploaded datasets
The message is clear. Accurate monitoring reduces conservative assumptions.
New Fuel Property Methodology for 2025 and 2026
A major update concerns fuel properties. The Commission introduces a structured flexibility approach using Union airport reporting thresholds and statistical filtering of outliers. Where reporting rates exceed defined thresholds, extreme values beyond two standard deviations are excluded before calculating maximum or minimum values.
This refinement improves realism while maintaining regulatory robustness. Default Jet A1 values remain applicable only where reporting falls below minimum thresholds.
Enhanced NEATS Integration
Version 2.1 also aligns closely with the rollout of NEATS versions, including automated XML report generation and clearer integration pathways for future Commission approved third party tools.
Method C remains the default weather-based approach, while Method D is preserved for small emitters. The climate models used within NEATS are now described more transparently, including BFFM2, CoCiP, aCCFs, and OpenAirClim.
Conclusion
The updated MRV non CO2 Guidance shifts the focus from regulatory introduction to operational precision. The transition phase is structured, data responsibilities are clearer, and fuel property handling is more robust.
For aircraft operators, the strategic opportunity lies in moving beyond minimum compliance toward data driven optimisation. Accurate Primary data does not only reduce conservative overestimation. It creates insight into operational climate impact.
As the aviation sector advances toward comprehensive climate accountability, early alignment with these refined data standards will differentiate proactive operators from reactive ones.
Download Document File Here: MRV non-CO2 data collection Guidance