Mast Wood Preserve MT1 · Montana
MT1 MRV Results
Vault performance exceeding expectations
Daily methane data tracking 1000x lower than Registry and project limits despite peak year-one potential
Monthly methane: observed vs. modeled vs. accounted for
Grams of CH₄ per month. Hollow markers are projections.
Cumulative methane since monitoring began
Running totals in grams of CH₄. Dashed lines are projections.
Show data table
What this tells us
Biomass storage sites are credited based on conservative models for methane generation. MT1 is performing exceedingly well, even better than we modeled, while also contributing new scientific evidence for biomass burial as a highly efficient and scalable pathway for durable carbon removal that benefits forests and communities.
How it’s measured
Since August 2025, we have continuously monitored surface CH₄ and CO₂ within the MT1 perimeter, with remote access to the data and a methane resolution of 1 part per million. Sensors around the perimeter measure gas concentration, wind speed and wind direction, continuously across the entire project area, which together quantify the total volume of emissions from the site.
Allowed: the methane volume accounted for in Puro.earth’s conservative deductions, with 35% methane oxidation applied. Modeled: Mast’s internal conservative projection, including methane oxidation based on Chanton et al. 2011. Observed: measured by the MT1 perimeter sensor array. Running totals are calculated from the monthly values.
Built to last
Year {year} of {credited}+
Vault conditions indicate the carbon within the logs will remain sequestered for the project's credited duration and beyond. MT1 is further secured by a long-term land easement and independent stewardship fund for future maintenance and monitoring.