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Table 3 Geometric mean PM2.5 and CO concentrations at selected times and locationsa

From: Air pollution dispersion from biomass stoves to neighboring homes in Mirpur, Dhaka, Bangladesh

Location of monitor At baseline (5-6 am) During index stove cooking Non-cooking time 24 h
Mean (SD) Mean (SD) Mean (SD) Mean (SD)
Geometric mean PM2.5 (μg/m3)a (N = 88 monitors)
 Index stove (n = 8)b 29.8 (8.3) 326.3 (211.6) 62.9 (32.7) 61.5 (27.3)
 Index home (n = 9)b 28.4 (28.4) 322.7 (408.1) 54.2 (18.7) 51.9 (16.8)
 Neighbor home—shared wall (n = 18) 27.6 (5.1) 278.4 (423.7) 51.4 (15.4) 47.1 (10.0)
 Outdoor (n = 8) 33.2 (10.9) 154.2 (80.6) 70.7 (25.9) 57.1 (19.9)
 Neighbor home—no shared wall (n = 44) 30.0 (7.4) 83.1 (49.2) 63.5 (40.5) 47.5 (14.9)
p-value (ANOVA) 0.5 0.005 0.6 0.1
Geometric mean CO (ppm)a (N = 93 monitors)
 Index stove (n = 9)b 0.001 (0) 12.3 (13.2) 0.02 (0.04) 0.02 (0.03)
 Index home (n = 9)b 0.002 (0.002) 11.2 (18.8) 0.03 (0.08) 0.03 (0.04)
 Neighbor home—shared wall (n = 18) 0.001 (0.00003) 3.6 (7.3) 0.02 (0.05) 0.01 (0.05)
 Outdoor (n = 9) 0.001 (0) 0.7 (1.3) 0.003 (0.003) 0.006 (0.008)
 Neighbor home—no shared wall (n = 48) 0.001 (0.00002)b 0.2 (0.6) 0.002 (0.002) 0.006 (0.01)
p-value (ANOVA) 0.8 < 0.0001 0.1 0.007
  1. aLowest possible values are 25 μg/m3 for PM2.5 concentration and 0.001 ppm for CO concentration
  2. bOne high outlier excluded