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Volatile Organic Compounds Inside Homes Impacted by Smoke from the Marshall Fire
William D Dresser1,2, Jonathan M Silberstein3, Colleen E Reid4
1Department of Chemistry, University of Colorado Boulder, Boulder, Colorado 80309, United States.
Wildfires impacting indoor air quality release volatile organic compounds (VOCs) that persist for weeks. Mitigation strategies like air cleaners and ventilation significantly reduce indoor VOC levels.
Area of Science:
- Environmental Science
- Atmospheric Chemistry
- Public Health
Background:
- Wildland-urban interface (WUI) fires are increasing due to development and climate change.
- WUI fires pose significant risks to indoor air quality.
- Understanding the behavior of indoor air pollutants after WUI fires is crucial.
Purpose of the Study:
- To investigate the impact of a WUI fire on indoor air quality.
- To measure volatile organic compounds (VOCs) and their persistence.
- To evaluate the effectiveness of mitigation strategies for indoor air pollution.
Main Methods:
- Field measurements of VOCs using Proton-Transfer-Reaction Time-of-Flight Mass Spectrometry (PTR-TOF-MS).
- Analysis of VOC composition, comparing biomass burning and indoor sources.
- Assessment of polycyclic aromatic hydrocarbon (PAH) distributions in gas and ash phases.
- Testing mitigation strategies including air cleaners and window ventilation.
Main Results:
- VOC mixing ratios decreased slowly over 5 weeks post-fire, reaching ~20% of initial levels.
- Indoor VOC composition was a mix of biomass burning and indoor emissions.
- Significant differences in PAH distribution were observed between gas, ash, and fuel.
- Air cleaners and ventilation reduced average indoor VOC levels by over 50%.
Conclusions:
- Indoor VOCs from WUI fires exhibit slow decline due to indoor reservoirs, not just surface deposition.
- Activated carbon air cleaners and ventilation are effective in reducing indoor VOCs.
- Further research is needed to fully understand VOC release dynamics from indoor reservoirs.
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