Annual Guide 2025 I SOURCE TESTING ASSOCIATION


Members have the opportunity to contribute to updates in EA guidance and CEN and ISO standards. Additionally, the group undertakes special projects, often with support from EA or DIUS, to investigate specifi c challenges within stack testing methods.


Process Operators Task Group


The Process Operators Task Group meets three times a year, often in collaboration with other groups, to review legislative and standard developments. Members share experiences in continuous monitoring, quality assurance, permitting, and reporting, providing practical insights that support enhanced operational practices.


Equipment Suppliers Task Group


Representing manufacturers and suppliers of particulate and gas continuous emissions monitors (CEMs), portable instruments, sampling equipment, and calibration gases, the Equipment Suppliers Task Group serves as a regulatory and certifi cation focal point for emissions monitoring. With a particular emphasis on technical matters, this group provides input on UK regulatory consultations, the MCERTS certifi cation process, European and MID standards, and common issues within the supplier community.


EN14181 Task Group


The EN14181 Task Group reviews requirements for BS EN 14181 compliance and EA’s Method Implementation Documents (MID). Signifi cant progress has been made in recent meetings, covering topics such as:


• MID EN ISO 16911-2 accreditation and stack fl ow requirements


• Sample location planning requirements • QAL3 requirements for fl ow meters


• Addressing absolute uncertainties for low emission limit values (ELVs)


• DAHS (Data Acquisition & Handling Systems) requirements as per EN 17255-4


• Calibration functions for NOx monitoring


The group also created an STA guidance document titled AST Failings – Best Practice Guidance.


Carbon Capture and Biogenic


Task Group With the UK’s transition to net zero, the Department for Energy Security and Net Zero (DESNZ) has prioritized replacing the current energy mix with cleaner domestic sources. This move involves renewable energy, hydrogen, combustion with carbon capture and storage (CCUS), and nuclear energy.


Part of this transition includes doubling the UK’s electricity generation capacity and achieving full decarbonisation of the power sector by the mid-2030s. The government’s Clean Growth Strategy also aims to capture and store 20–30 million tons of CO₂ annually by 2030, positioning the UK as a leader in CCUS technology.


As CCUS advances, new measurement techniques will be essential to quantify carbon capture rates and emissions from process solvents and degradation products to meet regulatory requirements. STA members, including equipment suppliers, test houses, regulators, and process operators, will be directly impacted by these changes. To support this transition, STA has established a task group to guide members through these shifts, with the initial step being the creation of a working group to defi ne key areas of focus for members.


STA Guidance Note Database


The STA maintains a comprehensive guidance note database, providing resources across health & safety, quality, and technical domains. Key sections include:


• Health & Safety: Covers topics like chemical exposure, PPE, LOLER regulations, electrical supply safety, and risk assessments.


• Quality: Provides guidance on sample custody, calibration, isokinetic sampling, and uncertainty in stack testing.


• Technical: Offers resources on specifi c monitoring methods, gas analyser calibration, and procedures for challenging environments.


Each guidance note refl ects the STA’s commitment to supporting best practices in emission monitoring and ensuring that members have access to up-to-date resources.


Get Involved


STA members interested in contributing to the future of emission monitoring are encouraged to participate in task groups. This involvement helps members stay current on regulatory changes, share expertise, and promote continuous improvement across the industry.


Help shape the future of emission monitoring with STA’s dedicated task groups.


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