National Trends in PM25 Concentrations in 2000 - 2010
| Year |
Mean |
Number of Trend Sites |
10th Percentile |
90th Percentile |
| 2000 |
13.6203537059422 |
646 |
8.90435823754789 |
17.7333420576758 |
| 2001 |
13.277356471606 |
646 |
8.80571428571429 |
17.1434625196765 |
| 2002 |
12.7973034229018 |
646 |
8.47338934795275 |
16.2533783068783 |
| 2003 |
12.3864134901478 |
646 |
7.98099567099567 |
15.8691952100873 |
| 2004 |
11.9698684519895 |
646 |
8.10721289380911 |
15.3348252688172 |
| 2005 |
12.9579348949946 |
646 |
7.940180756396 |
16.7222989340862 |
| 2006 |
11.6569514783993 |
646 |
8.04207489509214 |
14.9003978779841 |
| 2007 |
12.0206048276922 |
646 |
7.83408008658009 |
15.4124910394265 |
| 2008 |
10.8625085549841 |
646 |
7.51777213728301 |
13.4440740740741 |
| 2009 |
9.81599838008592 |
646 |
6.99584129638477 |
12.277626705653 |
| 2010 |
9.99205709640912 |
646 |
6.77739748677249 |
12.998835125448 |