Summary
Active remediation systems in NSW are about to face a stricter approvals pathway.
The NSW Environment Protection Authority has launched a review of the Approved Methods for the Modelling and Assessment of Air Pollutants. This statutory document dictates how emissions from stationary sources must be assessed to inform regulatory decisions under the POEO Act.
While primarily an industrial compliance update, this has high stakes for contaminated land and waste management. Any site relying on soil vapour extraction, thermal desorption units, or active landfill gas flaring will be subject to these modernised modelling requirements to secure or maintain an Environment Protection Licence.
Site auditors and consultants will need to adopt rigorous baseline data collection and advanced modelling software. Relying on older methodologies for an Environmental Impact Statement could result in costly delays or rejected site approvals.
Have you checked if your proposed emission control designs remain viable under the draft framework?
This is an Machete news summary. Full summary and source references are available at the link below.
Further detail
The technical implications of the updated Approved Methods require close attention from practitioners designing and operating active remediation systems.
Historically, air dispersion modelling for temporary or mobile remediation plants has sometimes relied on conservative screening assessments. The proposed alignment with the NSW Clean Air Strategy and the NSW EPA Climate Change Policy signals a transition towards requiring site-specific meteorological data and advanced predictive modelling, even for short-term operations.
Under the Protection of the Environment Operations Act 1997, the Approved Methods are legally binding for any facility requiring an Environment Protection Licence. Calculations for stack emissions from soil vapour extraction systems or thermal desorption units must strictly comply with the revised methodologies.
Practitioners should review the consultation draft to evaluate how the new requirements will impact their preferred remediation technologies. Upgrading modelling software and expanding baseline monitoring programmes will likely increase upfront assessment costs, yet these steps are necessary to ensure compliance and avoid regulatory notices.
Background and context
The NSW Environment Protection Authority (EPA) has launched a major review and opened public consultation to modernise the Approved Methods for the Modelling and Assessment of Air Pollutants in NSW. This critical statutory document sets the mandatory requirements for how air emissions from stationary sources—including landfills, mines, and industrial facilities—are modelled and assessed to inform regulatory decisions under the POEO Act. The draft updates aim to align the state's modelling techniques with contemporary science, emerging technologies, and the NSW Clean Air Strategy.
Why it matters for environmental professionals and their clients
While primarily an air quality update, this has direct, high-stakes implications for contaminated land and waste management practitioners. Any remediation strategy that involves stationary stack emissions—such as soil vapour extraction (SVE) systems, thermal desorption units, or active landfill gas flaring—will be subject to these new modelling requirements to secure or maintain an Environment Protection Licence (EPL).
Environmental consultants and site auditors will likely need to adopt more rigorous baseline data collection and advanced modelling software for Environmental Impact Statements (EIS) and site approvals. Practitioners should urgently review the draft methods during the consultation period to ensure their preferred remediation technologies and emission control designs remain viable and compliant under the proposed stricter modelling frameworks.
NSW EPA launches major review of statutory air pollution modelling methods, impacting approvals for landfills and active remediation systems.
References and related sources
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This is an iEnvi Machete news summary. Prepared by iEnvi to summarise the source article for contaminated land, groundwater, remediation, approvals and site risk professionals.
Published: 23 Mar 2026
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