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  • 1Civil and Environmental Engineering, Virginia Tech, 1145 Perry Street, Blacksburg, VA, USA. lmarr@vt.edu.

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Indoor environments have significantly more surface area than previously assumed, impacting air chemistry. This study quantified room contents, revealing higher surface-area-to-volume ratios crucial for understanding indoor air processes.

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Area of Science:

  • Environmental Chemistry
  • Indoor Air Quality
  • Surface Science

Background:

  • Indoor air processes like deposition, partitioning, and reactions depend on surface interactions.
  • Previous models may underestimate the available surface area within indoor environments.

Purpose of the Study:

  • To characterize the surface area, volume, shape, and material of objects in various indoor rooms.
  • To determine the impact of room contents on surface-area-to-volume ratios.
  • To provide data for more accurate indoor air chemistry models.

Main Methods:

  • Measurements of surface area, volume, shape, and material of objects in 10 bedrooms, 9 kitchens, and 3 offices.
  • Resolution of measurements at approximately 1 cm.
  • Calculation of surface-area-to-volume ratios with and without considering room contents.

Main Results:

  • The ratio of surface area with contents to that without averaged 1.5 ± 0.3 across all rooms.
  • Accounting for contents increased the surface-area-to-volume ratio by 78% (from 1.8 to 3.2 m-1).
  • Paint and stained wood were the most common surface materials, varying by room type.

Conclusions:

  • Indoor room contents significantly increase the available surface area for air-surface interactions.
  • The complexity and extent of indoor surfaces are greater than often modeled.
  • Findings are critical for improving the accuracy of indoor air chemistry and quality assessments.