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 |