Effect of Ambient PM2.5-Bound BbFA and DahA on Small Airway Dysfunction of Primary Schoolchildren in Northeast China
Table 1
Comparison of ambient concentrations of PM2.5-bound PAH456 in schools A and B during heating and nonheating seasons (ng/m3).
Heating season
Nonheating season
School A
School B
School A
School B
GMs
M
P25
P50
P75
GMs
M
P25
P50
P75
GMs
M
P25
P50
P75
GMs
M
P25
P50
P75
FLA
6.98
6.74
2.96
6.74
16.28
11.59
9.83
5.59
9.83
21.30
0.093
0.49
0.44
0.28
0.44
0.78
0.53
0.52
0.36
0.53
0.84
0.60
PY
7.30
7.41
3.29
7.41
18.48
9.84
9.11
4.56
9.11
18.50
0.154
0.30
0.32
0.19
0.32
0.70
0.40
0.55
0.27
0.55
0.99
0.31
CHR
8.34
8.23
4.36
8.23
15.95
10.74
10.36
5.79
10.36
17.75
0.067
0.65
0.74
0.39
0.74
1.65
0.61
0.74
0.46
0.74
1.22
0.32
BaA
8.51
8.69
4.01
8.69
17.70
11.20
11.30
5.18
11.30
21.95
0.060
0.47
0.39
0.20
0.39
1.78
0.44
0.39
0.24
0.39
0.88
0.48
BbFA
6.00
5.88
3.28
5.88
11.28
8.28
7.96
5.24
7.96
12.85
0.019
1.00
1.10
0.68
1.10
1.74
1.17
1.19
0.79
1.19
1.94
0.35
BkFA
3.79
4.65
1.65
4.65
10.30
5.57
6.80
2.74
6.80
10.59
0.042
0.93
1.01
0.59
1.02
1.61
1.00
1.06
0.75
1.06
1.76
0.24
BaP
5.23
5.31
2.82
5.31
9.84
6.59
6.46
3.50
6.46
11.65
0.034
0.53
0.47
0.29
0.47
1.02
0.54
0.47
0.28
0.47
1.14
0.21
DahA
0.82
0.89
0.38
0.89
1.60
1.03
0.99
0.52
0.99
2.15
0.037
0.10
0.11
0.05
0.11
0.17
0.12
0.11
0.06
0.12
0.27
0.45
BghiP
2.48
3.63
1.30
3.63
6.06
3.54
4.03
1.59
4.03
7.63
0.069
0.56
0.54
0.30
0.54
1.10
0.63
0.66
0.29
0.66
1.30
0.27
IcdP
2.66
3.50
1.12
3.50
7.19
3.40
4.47
1.35
4.47
8.90
0.075
0.49
0.44
0.26
0.44
0.96
0.57
0.53
0.27
0.53
1.22
0.13
Σ10-PAHs
54.72
52.25
26.89
52.25
115.24
76.32
75.71
39.49
75.71
125.81
0.046
5.96
6.44
3.79
6.44
10.22
6.69
6.56
4.42
6.56
9.87
0.37
GMs, geometric means; M, median; Σ10-PAHs, sum of 4–6-ring PAH concentrations; vs. ambient PM2.5-bound 4–6-ring PAHs in school A during the heating season.