Table 2 Average bias and standard deviation on NO2 diffusion tubes by laboratory
Laboratory Code Average Bias1 of Measurements from Reference Value (%) Average Standard Deviation2 in Measurements (ppb)
1 49.0 1.14
2 16.8 3.52
5 -21.7 2.02
6 9.4 3.06
7 -1.8 3.83
8 -26.2 2.44
9 -16.5 0.68
10 -0.5 1.21
11 -23.6 1.15
12 -5.9 1.94
13 40.2 4.17
15 26.7 1.46
16 11.8 0.96
17 7.6 1.81
18 16.0 1.53
19 -26.3 0.96
21 12.8 2.29
22 -23.5 2.27
23 57.9 5.21
26 10.3 2.27
27 10.4 5.15
28 -16.6 0.76
30 22.0 1.09
32 3.2 2.41
34 -11.1 0.72
35 -7.8 7.50
36 14.1 3.15
37 19.9 5.00
38   1.97
39 21.9 7.43
40 -1.7 2.36
41 -23.8 1.30
42 -39.3 1.28
43 -23.2 1.79
44 1.6 2.63
47 -13.7 1.62
48 -8.5 0.73
49 2.6 5.73
Average 1.7 2.56
Note:
1. Average bias (%) is derived from average percentage bias of each set of triplicate measurements from exposure periods 1-3 relative to the average measurement from all diffusion tube results reported per exposure period)
2. Average standard deviation is derived from the average standard deviation associated with each set of triplicate measurements from exposure periods 1-3.

Back