Deposition, resuspension, and penetration of particles within a residence

摘要: Abstract Aerosol concentrations and particle size distributions were measured indoors outdoors at a two-storey residence in California during the summer months. A single central sampling point downstairs living area was used for all indoor samples. The deposition rate supermicron particles by raising concentration simultaneously measuring air infiltration rates decay rates. For between 1 5 μm diameter, velocity closely matched calculated settling velocity. larger than less velocity, probably due to nonspherical nature of these particles. penetration factor particles, measure amount filtration achieved building shell, using experimentally determined velocities indoor/outdoor ratios when no resuspension or generation activities present. one found, indicating that shell not effective removing infiltrating Resuspension under several different conditions found have significant impact on concentrations. Just walking into room can increase 100% some sizes. light activity with four people residence, 1.8 × 10−5 3.8 10−4 h−1 assuming density gm−3. These may be lower actual assumptions made about distribution floor dust.