Table III.
Analysis of Source vs. Non-source concentration values for selected trips
| Median Concentration | |||||
|---|---|---|---|---|---|
| City | Potential Source Wind Directions | Source Wind Directions | Non-Source Wind Directions | Median Differences in Source and Non-source Concentrations | |
| Indianapolis, IN | S, SSW,SW, WSW, W | PM2.5
EC OC |
27.73
0.54 7.68 |
1.32
017 4.45 |
26.41***
0.37*** 3.23*** |
| Kernersville, NC | S, SE, SSE | PM2.5
EC OC |
19.36
1.27 10.48 |
16.05
0.92 7.30 |
3.31
0.35*** 3.18*** |
|
Valdosta, GA
Site 1 |
ESE, SE, SSE, S, SSW, SW, WSW, W | PM2.5
EC OC |
11.86
0.30 4.20 |
11.78
0.29 4.16 |
0.08
0.01 0.04* |
|
Valdosta, GA
Site 2 |
E, ESE, SE, SSE, S, SSW, SW, WSW, W, WNW, NW, NNW | PM2.5
EC OC |
6.75
0 0 |
13.11
0.57 6.61 |
−6.36
0.57 −6.61 |
All concentration values expressed in μg/m3. Wilcoxon Rank-Sum Test used to determine statistical significance in concentrations from source and non-source wind directions (***=0.01, **=0.05, *=0.10).