| Historic (1865-12-01 to
2009-12-20) |
| Rank |
Entity Name |
Count |
Score |
Coref./Ref. |
| 1 |
NO2
|
1278 |
9919.1 |
  |
| 2 |
Cl
|
1041 |
6339.3 |
  |
| 3 |
NH4+
|
625 |
5325.8 |
  |
| 4 |
SO4
|
588 |
4983.5 |
  |
| 5 |
nitrate
|
694 |
4275.8 |
  |
| 6 |
Br
|
424 |
3562.7 |
  |
| 7 |
SCN
|
256 |
2427.2 |
  |
| 8 |
H2O
|
273 |
2206.7 |
  |
| 9 |
NH4
|
244 |
2098.1 |
  |
| 10 |
ClO4
|
204 |
1955.2 |
  |
| 11 |
nitrogen
|
330 |
1709.2 |
  |
| 12 |
K+
|
236 |
1455.1 |
  |
| 13 |
Pb
|
214 |
1434.3 |
  |
| 14 |
Cu
|
226 |
1328.7 |
  |
| 15 |
nitric oxide
|
218 |
1289.7 |
  |
|
| 10 years (1999-12-23 to
2009-12-20) |
| Rank |
Entity Name |
Count |
Score |
Coref./Ref. |
| 1 |
NO2
|
657 |
4817.7 |
  |
| 2 |
NH4+
|
488 |
3874.4 |
  |
| 3 |
SO4
|
437 |
3442.9 |
  |
| 4 |
Cl
|
469 |
2644.7 |
  |
| 5 |
nitrate
|
470 |
2604.8 |
  |
| 6 |
H2O
|
254 |
1891.0 |
  |
| 7 |
NH4
|
219 |
1725.9 |
  |
| 8 |
ClO4
|
154 |
1363.9 |
  |
| 9 |
Br
|
153 |
1150.6 |
  |
| 10 |
nitrogen
|
246 |
1078.3 |
  |
| 11 |
Cu
|
187 |
952.6 |
  |
| 12 |
PO4
|
115 |
926.4 |
  |
| 13 |
Fe
|
144 |
849.9 |
  |
| 14 |
K+
|
135 |
784.3 |
  |
| 15 |
Zn
|
136 |
745.2 |
  |
|
|