Average Ozone (parts per million)
|
U.S.
|
Michigan
|
Midland County
|
|
2004
|
0.047
|
0.0475
|
0.049
|
|
2005
|
0.0505
|
0.0532
|
0.0506
|
|
2006
|
0.0496
|
0.0489
|
0.049
|
|
2007
|
0.0499
|
0.0518
|
0.0503
|
|
2008
|
0.0478
|
0.0486
|
0.047
|
|
2009
|
0.0447
|
0.0454
|
0.0433
|
Source: USA.com www.usa.com
| Average Ozone (parts per million) |
Environment
