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Table 4 Geometric Mean (Geometric Standard Deviation) of Indoor/Outdoor Ratios and Indoor Spore Concentrations by Ventilation/Filtration Type

From: Control of asthma triggers in indoor air with air cleaners: a modeling analysis

Ventilation on/Filtration I/O Ratio Whole House (spores/m3) Bedroom 2a (spores/m3)
N 0.34 (2.6) 303 (7.0) 238 (9.4)
C 0.16 (2.7) 141 (5.8) 131 (6.3)
C5 0.13 (3.1) 111 (6.7) 97 (8.0)
C+1P 0.14 (2.9) 128 (6.0) 54 (8.5)
C+2P 0.14 (2.9) 119 (6.2) 52 (8.8)
HE 0.07 (4.1) 57 (8.3) 41 (13.0)
  1. aBedroom 2 contains a portable air cleaner