One emissions record, every destination it has to reach — greenhouse gas inventory, state emission inventories, criteria and hazardous air pollutants, permit limits, and ESG disclosure. Calculated from the same source data, defensible to the same audit.
Platform / EMISSIONS
Where the reading meets the limit.
THE CHALLENGE
One measurement. Six methodology. Six outputs.
A single source can generate emission numbers for greenhouse gas submission, a state emission inventory, a Title V deviation report, a HAP major-source determination, and an investor's ESG disclosure. In many operations those are separate calculations, stored in different data sets, run by different people, generated at different intervals, and using different inputs.
Master your emissions process in one place.
The authorities over your emissions.
Every obligation your emissions data has to satisfy.
WHAT ASSETAS COVERS
Six reporting regimes, one source of truth underneath them.
01 — Greenhouse gas
GHG inventory and mandatory reporting
Emissions calculated from source data under 40 CFR Part 98 — subpart W for petroleum and natural gas systems, subpart C for stationary combustion, and the subparts that apply to your source types. Every calculated figure retains the readings, run hours, throughput, and equipment counts behind it.
02 — State reporting
State emission inventories
Every state runs its own inventory program, on its own schedule, in its own format. Assetas maintains the source-level detail each one expects — throughput, control efficiency, operating schedule, source classification — held per emission unit, so a change at one site updates the inventory rather than triggering a rebuild.
03 — Criteria pollutants
Criteria pollutants and NAAQS
NOₓ, SO₂, CO, PM₁₀ and PM₂.₅, VOC as an ozone precursor, and lead — tracked per emission unit against the thresholds that decide your permitting status. Potential to Emit (PTE) and Actual emissions maintained side by side, because the difference between them is what makes you a major source.
04 — Air toxics
Hazardous air pollutants
The pollutants listed under Clean Air Act section 112 tracked at unit level, against both thresholds that matter: 10 tons per year for any single HAP and 25 tons per year aggregate. Applicable NESHAP subparts attach to the equipment they govern, with the monitoring and notification obligations each one carries.
05 — PERMITTING
Permit conditions and deviations
Title V and minor-source conditions held as live limits, not as a PDF in a folder. Rolling 12-month totals calculate continuously, so you see a limit approaching rather than discovering it was exceeded. Deviations are captured when they happen — cause, duration, corrective action, and the reporting clock they started.
06 — esg
ESG emissions and investor reporting
Scope 1 and Scope 2 built from the operational record rather than estimated from spend — and the Scope 3 categories you can actually substantiate. Because the calculation lineage is intact, an assurance provider can trace a reported figure back to the reading that produced it.
HOW ASSETAS WORKS
One calculation chain, from reading to submission.
Submit in the required format
The same underlying data delivered as the report, spreadsheet, or machine-readable file each destination expects — built to the schema the recipient actually publishes.
Aggregate to every threshold
Unit totals roll to source, site, and organization on the schedules each program requires — annual for inventory, rolling 12-month for permits, continuous for internal review.
Calculate with the appropriate methodology
Emission factors, calculations, simulation and modeling, and mass balance applied per source type and reporting program , with the method and factor version recorded alongside the result.
Capture inputs at the source
Meter readings, run hours, and throughput from telemetry plus inspection results from a technician's tablet — each tied to the source asset that produced it, timestamped at capture rather than at upload.
THE CHALLENGE
Every number traces back to a reading.
An emissions figure is only as good as your ability to defend your inputs. When an agency inspector, a third-party verifier, or an assurance provider asks where a number came from, the answer should take minutes.
-
Calculation lineage — the source readings behind every reported figure
-
Factor versioning — the method and emission factor in effect when it was calculated
-
Point-in-time requirements — what the limit was on the date the work was done
-
Immutable audit log — who entered what, and what changed since
-
Retention schedules — records held for the periods Part 98 and Title V require
Delivered the way the regulator wants it.
Where DATA goes
Every agency has its own portal, its own schema, and its own idea of a complete submission. Maps your records to each destination and generates the reporting output automatically, consistently, and with confidence.
BY INDUSTRY
Same computational engine. Different requirement library.
COMMON TOPICS WITH OUR CLIENTS
Emissions reporting trends.
No. EPA's September 2025 proposal would suspend subpart W reporting for most segments until reporting year 2034, but it drew more than 53,000 comments and has not been finalized. Until final action occurs, the GHGRP remains in effect, and in February 2026 EPA extended the 2025 reporting deadline from 31 March to 30 October 2026.
Separately, the Waste Emissions Charge rule was disapproved under the Congressional Review Act in March 2025, though the joint resolution did not repeal the underlying tax — that would require the ordinary legislative process. So the fee exposure is dormant while the reporting obligation is live.
A conventional inventory multiplies equipment counts and activity data by published emission factors. A measurement-informed one starts from the same structure but has to absorb actual measurement — continuous monitors, aerial surveys, direct source quantification — and correct the estimate against it. Under the 2024 subpart W amendments, measurement-based data must be used when available, including data collected for other regulatory or voluntary programs. The practical shift is that you're no longer producing one number from one method. You're reconciling several methods into a number you can defend, which makes the audit trail as important as the arithmetic.
While "loosening" describes current Federal attitudes, there are additional considerations. Federal requirements softened, but states moved the other way — your binding obligation is the strictest state you operate in, not the federal floor. Investors pulled back on mandate, not on the question: US private equity investors want emission intensity and can tie lending rates to intensity reduction targets and the EU's Omnibus narrowed CSRD scope, but the same data requests now arrive from customers and banks instead of regulators. EU buyers are tightening outright — from January 2027, EU importers must show MRV equivalence, with reconciliation and independent verification. Scope your measurement to what actually binds you, and build the record underneath it once.
Because the calculation was never the hard part. The work is assembling the inputs: what equipment exists, what it ran, under what controls, with what malfunction rate — data that lives in SCADA, in maintenance records, in a contractor's spreadsheet, and in one person's memory. The 2024 subpart W amendments added new emission sources to improve inventory accuracy, so equipment lists that were complete last year aren't now. Then the same underlying data has to be reshaped for each destination — Colorado's ONGAEIR workbooks are due 30 June each year under Regulation 7, Texas wants a different set through STEERS, and eGGRT wants a third. Three months of assembly, one afternoon of arithmetic.
Often neither, and the gap can be enormous. One published study found a 96% difference between an operator's bottom-up inventory at 20.5 scfh and an end-of-project top-down average of 508 scfh — traced to a single one-off tank event captured during a flyover. Two snapshots taken by different methods can't explain each other; continuous data can, because it distinguishes a persistent baseline from a short-lived event. This is why reconciliation has become a formal requirement rather than good practice — UT Austin's CEESA protocol, published in August 2026, establishes requirements for site-level measurement and for reconciling source-level and site-level evidence into a producer-level inventory, with defined documentation, data-management and QA/QC requirements.
It catches what's dramatic, not what's large in aggregate. The IEA's 2026 Global Methane Tracker cites a continuous-monitoring study across 940 US upstream facilities that found 80–90% of estimated methane mass came from sources emitting below 100 kg/hr, while super-emitter events accounted for only 10–20% of the total over the study period. Routine surveys can reduce small component leaks but may miss larger combustion and venting sources, which is driving interest in combining handheld OGI with portable mass-flux instruments or aerial systems to build fuller site-level inventories. A defensible inventory has to represent the persistent long tail, and that means unit-level operational data collected continuously — not periodic campaign results alone.
Describe the service and how your customers or clients can benefit from it.
