Technical writing from the KeeWee verification team: how the rules work, what verifiers find, and the methods behind the numbers.How the rules work, what verifiers find, and the methods behind the numbers.
Building a PEMS used to mean hiring someone who could write the model. We built one on real plant data using Claude, and recorded every step. Four short videos show the workflow: preparing the data, describing the objective in plain English, and checking the results against the training scores.
KeeWee4 min read · 4 videosBuilding a PEMS used to mean hiring someone who could write the model. We built one on real plant data using Claude, and recorded every step. Four short videos show the workflow: preparing the data, describing the objective in plain English, and checking the results against the training scores.
KeeWee · 4 Sep 2026 · 4 min readA predictive emissions monitoring system estimates stack emissions from process data a facility already records, with no analyzer on the stack. It is an accepted alternative monitoring method in Canada and the US.
Build one with an AI assistantThe Carbon Offsetting and Reduction Scheme for International Aviation, run by ICAO. Airline operators monitor and report their CO₂ emissions and offset growth with CORSIA Eligible Emissions Units.
Read the CORSIA seriesCanada’s federal rules, administered by ECCC, that require suppliers of gasoline and diesel to lower the carbon intensity of the fuel they supply, with credits that must be verified.
What verifiers found in 2022 and 2024A predictive emissions monitoring system estimates stack emissions from process data a facility already records, with no analyzer on the stack.
From the simplified monitoring route for small emitters to offsetting and sustainable aviation fuel.
A technical overview of CORSIA offsetting, explaining how CORSIA Eligible Emissions Units (EEUs) are calculated, weighted, and cancelled across compliance cycles using ICAO’s offset equation.
Minxing Si3 min readA practical guide to ICAO’s five approved CORSIA fuel monitoring methods, helping large airline operators transition from simplified modeling to precise emissions reporting.
Minxing Si3 min readA practical guide to CORSIA’s simplified monitoring pathway, explaining who can use the ICAO CERT tool and how emissions are calculated for small emitters, new entrants, and exempt flights.
Minxing Si4 min readPeer-reviewed research shows how explainable, tree-based machine learning models like XGBoost can deliver regulatory-ready NOₓ predictions without black-box complexity.
KeeWee3 min readA study led by Minxing Si of KeeWee Solutions Inc. demonstrates how facility operators can achieve stringent regulatory precision requirements for NOx monitoring using standard process data and free machine learning libraries.
KeeWee3 min readGuide to correcting fuel consumption estimation errors in AQM v2.3 using API 2021 methodology.
Minxing Si6 min readCourse 101 teaches ISO 14064-3 verification end to end. Pass the final assessment to earn a Certificate of Attainment from KeeWee Solutions Inc.
