Table 2.
Summary of PM2.5 mass (μg/m3), chemical component concentrations (ng/m3), and source contributions (μg/m3)
| Bridgeport | Danbury | Hartford | New Haven | Springfield | |
|---|---|---|---|---|---|
| PM2.5 | 13.4 (0.4) | 13.2 (0.4) | 11.9 (0.2) | 17.0 (0.3) | 13.0 (0.3) |
| EC | 932.3 (33.5) | 728.0 (36.5) | 553.8 (16.9) | 1987.7 (30.5) | 645.1 (22.9) |
| Zn | 14.9 (0.6) | 14.6 (1.0) | 15.0 (0.5) | 22.7 (0.6) | 17.5 (0.7) |
| Pb | 3.2 (0.2) | 3.2 (0.2) | 3.1 (0.1) | 4.8 (0.1) | 4.2 (0.2) |
| Cu | 3.8 (0.2) | 3.1 (0.2) | 2.4 (0.1) | 6.3 (0.1) | 2.6 (0.2) |
| Br | 1.7 (0.1) | 1.7 (0.1) | 1.6 (0.0) | 1.9 (0.1) | 2.1 (0.1) |
| Si | 53.4 (3.2) | 56.0 (3.7) | 49.2 (2.3) | 116.9 (3.2) | 48.6 (2.1) |
| Fe | 103.5 (3.4) | 71.1 (2.8) | 60.3 (1.3) | 218.8 (3.6) | 73.8 (2.0) |
| Al | 31.2 (1.9) | 31.7 (2.1) | 27.5 (1.2) | 67.4 (1.6) | 26.6 (1.2) |
| Ca | 31.3 (1.1) | 29.0 (1.3) | 21.0 (0.5) | 51.1 (0.9) | 24.9 (0.7) |
| Ba | 3.4 (0.3) | 1.7 (0.2) | *1.2 (0.1) | 12.7 (0.3) | *1.0 (0.2) |
| Ti | 4.4 (0.2) | 4.2 (0.2) | 4.1 (0.2) | 7.2 (0.1) | 3.7 (0.1) |
| S | 1288.7 (51.3) | 1273.1 (52.5) | 1201.8 (28.8) | 1452.3 (31.8) | 1069.4 (35.7) |
| K | 53.2 (5.3) | 58.1 (4.0) | 54.5 (3.3) | 63.2 (3.8) | 57.7 (3.6) |
| V | 3.3 (0.2) | 2.2 (0.1) | 2.9 (0.1) | 9.9 (0.3) | 3.1 (0.1) |
| Ni | 2.6 (0.1) | 2.0 (0.1) | 2.5 (0.1) | 5.2 (0.2) | 2.2 (0.1) |
| Na | 147.0 (6.3) | 128.5 (5.5) | 129.1 (3.5) | 180.9 (4.9) | 109.7 (3.7) |
| Cl | 12.2 (2.8) | 5.9 (0.7) | 7.1 (0.6) | 29.6 (3.4) | 15.1 (2.6) |
| Mn | *2.5 (0.1) | *2.3 (0.1) | *2.3 (0.1) | 4.5 (0.1) | *2.5 (0.1) |
|
| |||||
| Regional Sulfur | 5.5 (0.3) | 6.1 (0.3) | 5.0 (0.2) | 7.1 (0.2) | 4.7 (0.2) |
| Motor Vehicle | 4.2 (0.2) | 3.3 (0.2) | 3.1 (0.1) | 5.0 (0.2) | 3.6 (0.2) |
| Road Dust | 1.2 (0.1) | 2.0 (0.1) | 0.8 (0.0) | 2.9 (0.1) | 1.4 (0.1) |
| Oil Combustion | 1.8 (0.1) | 0.6 (0.0) | 2.2 (0.1) | 1.4 (0.1) | 2.2 (0.1) |
| Sea Salt | 0.2 (0.0) | 0.3 (0.0) | 0.2 (0.0) | 0.4 (0.0) | 0.1 (0.0) |
Note: The concentrations of chemical components with an asterisk (*) were not used in PMF (more than 90% of the samples below the MDL; the signal-to-noise ratio less than 0.2), but they are presented for comparisons between sites.