Average Carbon Monoxide (CO) (parts per million)
|
U.S.
|
Michigan
|
Midland County
|
|
2004
|
0.5
|
0.37
|
0.29
|
|
2005
|
0.47
|
0.34
|
0.32
|
|
2006
|
0.44
|
0.33
|
0.32
|
|
2007
|
0.4
|
0.3
|
0.28
|
|
2008
|
0.37
|
0.33
|
0.28
|
|
2009
|
0.34
|
0.31
|
0.29
|
Source: USA.com www.usa.com
| Average Carbon Monoxide (CO) (parts per million) |
Environment
