Table 1.
Summary of the 5 clusters (bolded rows represent variables used in clustering)
| Cluster 1 – 1523 Days Winter Low Boundary Layer |
Cluster 2 – 1308 Days Summer Moderate Weather |
Cluster 3 – 1145 Days Winter High Boundary Layer |
Cluster 4 – 946 Days Summer Regional Pollution Event |
Cluster 5 – 834 Days Transition High SD of Temp. |
|
|---|---|---|---|---|---|
| Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | |
| Temp (C) | 2 (5) | 16 (4) | 4 (6) | 23 (3) | 13 (6) |
| max T past 3 days (C) | 7 (6) | 21 (6) | 9 (7) | 26 (4) | 16 (7) |
|
max T today (C) SD Hourly Temp (C) |
6 (5) 2 (1) |
19 (4) 2 (1) |
8 (6) 2 (1) |
29 (3) 3 (1) |
20 (6) 4 (1) |
| (mbar) | 5 (2) | 14 (4) | 6 (3) | 20 (4) | 9 (3) |
| Sea-Level Pressure (mbar) | 1022 (6) | 1016 (6) | 1007 (7) | 1013 (5) | 1017 (7) |
| Ozone (ppb) | 18 (9) | 22 (9) | 24 (9) | 35 (12) | 27 (11) |
| 8-hour max ozone (ppb) | 26 (10) | 32 (11) | 31 (9) | 52 (17) | 39 (14) |
| Wind Speed (m/s) | 5 (1) | 4 (1) | 7 (2) | 5 (1) | 5 (1) |
| Boundary Layer Height (m) | 686 (329) | 620 (226) | 1086 (399) | 785 (224) | 801 (312) |
| PM2.5 (ug/m3) | 10 (5) | 10 (5) | 7 (4) | 16 (9) | 10 (5) |
| Sulfur Dioxide (ppb) | 7 (4) | 3 (2) | 4 (3) | 3 (2) | 4 (3) |
| Nitrogen Dioxide (ppb) | 23 (7) | 19 (6) | 17 (6) | 19 (7) | 21 (8) |
| Nitrogen Monoxide (ppb) | 24 (20) | 15 (11) | 12 (8) | 9 (6) | 16 (12) |
| Black Carbon (ug/m3) | 0.9 (0.6) | 1.0 (0.6) | 0.6 (0.4) | 1.1 (0.6) | 0.9 (0.6) |
| Precipitation per day (mm) | 1 (5) | 3 (10) | 6 (12) | 2 (7) | 1 (4) |