Chemical Transformations of Infiltrated Wildfire Smoke on Indoor-Relevant Surfaces

Area of Science:

• Environmental Chemistry
• Indoor Air Quality

Background:

• Wildfire smoke infiltration significantly impacts indoor environments.
• Understanding smoke's interaction with indoor surfaces is crucial for mitigating health risks.

Purpose of the Study:

• To investigate the fate of wildfire smoke (gases and particles) on indoor surfaces.
• To determine how different building materials affect smoke chemistry and deposition.

Main Methods:

• Laboratory and field experiments using fresh smoke from ponderosa pine.
• Exposure of indoor-relevant surfaces (glass, rutile, kaolinite) to smoke.
• Analysis of surface-bound species and chemical transformations.

Main Results:

• Surface interactions varied significantly based on material type (glass, rutile, kaolinite).
• Kaolinite surfaces showed unique product formation from fresh smoke.
• Rutile surfaces exhibited larger particle formation after ozone-aged smoke exposure.

Conclusions:

• Indoor surfaces play a critical role in indoor air quality by altering smoke composition.
• Material-specific interactions influence the fate of wildfire smoke indoors.
• These findings are vital for developing strategies to improve indoor air quality during wildfire events.