Continuous emissions and flaring measurement for regulated sources.
Permanently installed, automated monitoring of exhaust-gas and stack emissions. FUTUREGAZ supports CEMS engineering, flaring measurement, data structuring, and compliance documentation across industrial and maritime operations.
CEMS applies wherever a regulated source requires continuous, instrument-based evidence of emissions performance, as opposed to periodic testing or calculation-only approaches. The regulatory requirement determines whether CEMS is mandatory; the operational context determines the measurement basis.
What this covers
Measurement system design and review
Extractive versus in-situ system selection, probe positioning, sample conditioning, analyser specification, and flow measurement integration. Includes DAHS (Data Acquisition and Handling System) architecture review.
Compliance documentation
Structuring of continuous emissions datasets for regulatory submission. Covers data availability reporting, exceedance identification, and evidence packaging aligned to IED, EPA 40 CFR Part 75, EU ETS, and MARPOL Annex VI requirements.
Quality assurance: QAL and calibration
QAL1 suitability assessment support, QAL2 field calibration planning, QAL3 drift monitoring, and Annual Surveillance Testing under the applicable CEMS quality framework. Calibration traceability from certified reference materials to instrument records.
DAHS data structuring and integration
Integration of raw analyser output into structured DAHS records with timestamps, quality flags, missing data substitution logic, and averaging period definitions aligned to applicable reporting requirements.
Flaring measurement and reporting
Quantification of flare gas volumes and composition for regulatory reporting, carbon accounting, and operational optimisation. Covers flow measurement approaches, composition estimation, and data trail documentation.
Emissions data verification
Independent verification of emissions datasets, calculation methodologies, and reporting outputs. Assessment of data completeness, flag logic, and audit trail integrity against applicable regulatory frameworks.
What CEMS measures and what it does not
CEMS provides continuous, instrument-based measurements at the stack. It does not replace separate source-testing requirements, and it does not cover fugitive or area emissions.
Actual stack concentrations
Real-time compound concentrations at the measurement point, averaged over defined reporting periods, with documented instrument performance and data availability.
Audit-ready data trail
A continuous, timestamped record with calibration traceability, QAL status, quality flags, and substitution methodology, structured to withstand regulatory inspection.
Source testing or periodic measurement
CEMS operates continuously between periodic source tests. QAL2 calibration requires periodic reference method testing; CEMS data alone does not substitute for this requirement under EN 14181.
Fugitive or area emissions
Stack CEMS measures point-source stack emissions. Fugitive emissions from equipment leaks, storage vessels, or area sources require separate measurement or estimation methodologies.
Industries and applications
Power generation
Gas turbines, combined cycle plants, and combustion sources regulated under EU IED or EPA 40 CFR Part 75. Continuous NOx, SO₂, CO₂, and O₂ monitoring with QAL certification.
Oil and gas
Offshore and onshore combustion sources, gas turbines, boilers, and flaring systems. Applicable to EU ETS and MARPOL Annex VI regulated operations.
Chemical and petrochemical
Process heaters, furnaces, incinerators, and complex multi-stack operations under IED permits. Data availability and exceedance management for integrated site reporting.
Steel and cement
High-temperature process emissions from blast furnaces, kilns, and sinter plants. Complex multi-compound monitoring with opacity and particulate measurement.
Waste-to-energy
Municipal solid waste and clinical waste incineration under Industrial Emissions Directive requirements, including HCl, HF and heavy-metals monitoring alongside standard stack parameters.
Maritime operations
SOx and NOx monitoring on vessels regulated under MARPOL Annex VI. Applicable to scrubber-equipped ships, ECA compliance monitoring, and port-state control requirements.
Applicable regulations and standards
US acid rain monitoring
Federal CEMS requirements for electricity generating units. Covers SO₂, NOx, CO₂, O₂, and volumetric flow measurement with defined QA/QC protocols and electronic reporting.
Industrial Emissions Directive
European framework for large combustion plants and industrial installations. Defines emission limit values and continuous monitoring obligations for major point sources.
CEMS quality assurance
European standard for quality assurance of automated measuring systems. Defines QAL1, QAL2, QAL3, and Annual Surveillance Test requirements for IED-regulated sources.
Marine air pollution
International convention limits for SOx and NOx from ship exhausts. Defines requirements for onboard continuous monitoring and emission control area (ECA) compliance.
Emissions trading and reporting
EU Emissions Trading System monitoring, reporting, and verification requirements. CEMS data used for verified annual emissions reports under the MRV regulation.
Measurement location and planning
Requirements for measurement section and measurement point siting, measurement objective, and documentation for stationary source emissions measurement.
Frequently asked questions
What is a CEMS system?
A Continuous Emissions Monitoring System is a permanently installed arrangement of analysers, data acquisition hardware, and reporting software that measures pollutant concentrations and gas flow at an emission source on an ongoing basis. It provides the time-stamped record required under the IED, EPA 40 CFR Part 75, MARPOL, and other regulatory frameworks.
What is EN 14181 and why does it matter?
EN 14181 is the European standard for quality assurance of automated measuring systems at stationary sources regulated under the Industrial Emissions Directive. It defines a quality assurance framework covering QAL1, QAL2, QAL3, and Annual Surveillance Testing, ensuring CEMS instruments remain accurate and traceable throughout their operating life.
What is the difference between QAL1, QAL2, and QAL3?
QAL1 is a type-approval assessment confirming an analyser is suitable for the intended application before installation. QAL2 establishes a site-specific calibration function through parallel testing against a certified reference method. QAL3 is an ongoing drift-monitoring programme that uses reference materials to verify day-to-day instrument stability between QAL2 campaigns.
What emissions sources require continuous monitoring under EU law?
Under the Industrial Emissions Directive, large combustion plants, waste incineration and co-incineration facilities, and certain other industrial installations are subject to continuous monitoring obligations. The specific parameters required depend on the installation type and the applicable BAT conclusions.
What is the difference between CEMS and periodic source testing?
CEMS provides a continuous record at every operating moment. Periodic source testing uses portable analysers or manual sampling over a defined test period, typically a few hours. Regulators require both: CEMS for ongoing compliance, and periodic testing to validate the CEMS calibration. They serve different evidential purposes.
Detailed service areas
Emissions work sometimes intersects with fuel measurement or requires an independent audit of existing monitoring systems.
Discuss an emissions monitoring requirement.
Describe the source type, regulated compounds, and applicable framework. We will respond with an appropriate approach.
Send an enquiry contact@futuregaz.com