New EU mandates have shifted the PFAS compliance frontier to the skies. While the revised Industrial Emissions Directive (IED) tightens facility permits, its sister regulation—the Industrial Emissions Portal Regulation (IEPR)—mandates reporting of perfluorooctanoic acid (PFOA) and perfluorohexanesulfonic acid (PFHxS) air emissions starting in 2028. Navigating the new mandates requires a technical departure from standard liquid analyses toward specialized, GC-based protocols.
Two Approaches to PFAS Air Monitoring
"What question are you trying to answer? That determines what sample you're taking," explained Caroline Widdowson during a recent Separation Science expert forum on air regulations. Widdowson, director of scientific affairs at Markes and a convenor of International Organization for Standardization (ISO) working groups on volatile organic compound (VOC) measurement, notes that for PFAS air monitoring, the question splits in two.
The first is exposure: what are building occupants breathing in from textiles, furnishings, and food contact materials? ASTM International is validating methodology for PFAS release from products, with fluorotelomer alcohols as the priority compound class. The second is ambient and source monitoring—identifying what's present near industrial sites and what leaves the stack.
Formed in July 2025, a European Committee for Standardization (CEN) working group is actively establishing official methods for ambient PFAS monitoring, source emissions, and deposition. This development timeline allows forward-looking laboratories to get ahead of the 2028 mandates by proactively building and validating their own internal workflows.
Verifying PFAS Destruction Means Measuring the Fragments
While wide-area ambient standards remain in development, regulators are aggressively targeting where PFAS risk and testing data do exist: industrial stacks and thermal treatment facilities. The immediate goal is confirming complete PFAS destruction during incineration processes.
Incineration above roughly 1,000 °C breaks long-chain PFAS apart, but incomplete destruction produces smaller fluorinated fragments—and the smallest, CF4 and C2F6, are the hardest of all to mineralize. They are also long-lived greenhouse gases, so a destruction process judged solely on its target compounds risks trading one problem for another.
The U.S. EPA's Other Test Method 50 (US EPA OTM-50) addresses this destruction challenge directly: it is the first EPA method to collect volatile fluorinated compounds in canisters from stacks and vents, allowing labs to calculate destruction efficiency from what survives treatment. Injecting a recalcitrant surrogate such as C2F6 and measuring what comes out gives a conservative benchmark for the whole process.
Optimizing Workflows for the Next Generation of Air Methods
Scaling up mass spectrometry for VOC analysis introduces analytical friction as target lists grow. The panelists identified three technical adjustments to manage more complex matrices:
- Mitigate moisture-induced analyte loss: The 2024 EU Air Quality Directive expands ambient monitoring parameters to include highly polar oxygenated VOCs like alcohols, ketones, and aldehydes. Because conventional moisture-removal hardware, such as Nafion dryers, strips out these target compounds along with water vapor, laboratories must adjust their thermal desorption configurations to preserve sample integrity without flooding the detector.
- Establish empirical calibration scales: As required detection limits drop, high-sensitivity techniques like Proton Transfer Reaction Mass Spectrometry (PTR-MS) employ advanced focusing lenses that deviate from linear mathematical models and require calibration using traceable reference materials.
- Prepare for non-targeted data bottlenecks: Broader compound lists and complex air matrices generate unmanageable volumes of chromatographic data. Testing facilities should adopt advanced data processing and non-targeted screening software to identify unexpected analyte patterns and automate system health checks.
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