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Related Concept Videos

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Humans continually engage with an environment rich in potentially harmful chemicals. These are introduced to our bodies through inhalation, ingestion, or skin contact. These chemicals exist in various forms, such as air and environmental pollutants, agricultural chemicals, organic solvents, and heavy metals.
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Evolution of Reactive Organic Compounds and Their Potential Health Risk in Wildfire Smoke.

Havala O T Pye1, Lu Xu2, Barron H Henderson3

  • 1Office of Research and Development, US Environmental Protection Agency, Durham, North Carolina 27711, United States.

Environmental Science & Technology
|October 22, 2024
PubMed
Summary

Wildfire smoke contains significant reactive organic compounds (ROC). Current emission inventories underestimate ROC mass, impacting health risk assessments for forest fire smoke.

Keywords:
air qualityhazardous air pollutantsorganic aerosolreactive organic compoundssmokevolatile organic compoundswildfires

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Area of Science:

  • Environmental Science
  • Atmospheric Chemistry
  • Public Health

Background:

  • Wildfires are a growing source of air pollution, with significant health implications.
  • The composition of wildfire smoke, particularly reactive organic compounds (ROC), influences health effects.
  • Accurate estimation of emissions is crucial for understanding smoke impacts.

Purpose of the Study:

  • To estimate reactive organic compounds (ROC) in western U.S. wildland forest fire smoke.
  • To compare emission inventory estimates with observed and modeled data.
  • To assess the contribution of ROC to health risks associated with wildfire smoke.

Main Methods:

  • Utilized data from the 2019 Fire Influence on Regional to Global Environments and Air Quality (FIREX-AQ) field campaign.
  • Employed the Community Multiscale Air Quality (CMAQ) model for predictions.
  • Analyzed gas-phase and particulate species abundances in both molar and mass-based units.

Main Results:

  • Standard emission inventories capture only 40-45% of estimated ROC mass, with primary organic aerosol significantly underestimated (5-8x).
  • Gas-phase species abundances downwind show production of fragmentation products like formaldehyde and methanol.
  • Fire emissions are estimated at 1250 ± 60 g·C of ROC per kg·C of CO, indicating substantial ROC carbon emissions.
  • Particulate ROC may dominate long-term cancer and noncancer health risks from smoke inhalation.

Conclusions:

  • Existing emission inventories for wildfire smoke are inadequate, particularly for ROC.
  • Understanding the mass and composition of particulate ROC is essential for accurate health risk assessments.
  • Further research into the toxicity of particulate ROC from forest fires is required to fully evaluate health impacts.