Average Particulate Matter (PM)2.5 (micrograms per cubic meter)
|
U.S.
|
Michigan
|
Midland County
|
|
2004
|
11.4
|
10.4
|
9.6
|
|
2005
|
12.4
|
12.7
|
11.7
|
|
2006
|
11.2
|
11.1
|
10.5
|
|
2007
|
11.5
|
11.7
|
10.2
|
|
2008
|
10.5
|
10.3
|
8.9
|
|
2009
|
9.5
|
8.9
|
8.1
|
Source: USA.com www.usa.com
| Average Particulate Matter (PM)2.5 (micrograms per cubic meter) |
Environment