VOC emissions from particle filtering half masks - methods, risks and need for further action

Area of Science:

• Environmental Science
• Occupational Health
• Polymer Science

Background:

• Polymer fleeces in particle filtering half masks are potential sources of volatile organic compound (VOC) emissions.
• Regulatory limits exist for VOCs, including German hygienic guide values and construction product guidelines.

Purpose of the Study:

• To investigate VOC emissions from polymer fleeces in filtering half masks.
• To evaluate emissions against established hygienic and construction product guidelines.
• To analyze the impact of venting and time on VOC reduction.

Main Methods:

• Gas chromatography-mass spectrometry (GC-MS) and gas chromatography-flame ionization detection (GC-FID) were used for VOC analysis.
• Emission measurements were taken immediately after opening and after two weeks of venting.
• VOC levels were monitored over time to observe emission decline patterns.

Main Results:

• All tested masks exceeded the total VOC (TVOC) hygienic guidance value (10 mg/m³).
• Xylene was detected in all masks; 94% contained up to 24 additional aromatic compounds.
• High detection rates for terpenes (17%), aldehydes (53%), caprolactam (77%), and siloxanes (98%) were observed.

Conclusions:

• Polymer fleeces in filtering half masks are significant sources of VOCs, often exceeding safety thresholds.
• Emissions exhibit an exponential decline over time with venting, suggesting a need for standardized pre-use procedures.
• Detector choice (MS vs. FID) and temperature significantly influence VOC quantification, impacting regulatory assessment.