National Trends in PM25 Concentrations in 2000 - 2015
| Year |
Mean |
Number of Trend Sites |
10th Percentile |
90th Percentile |
| 2000 |
13.5004169519305 |
480 |
8.83663429472749 |
17.7645892003755 |
| 2001 |
13.2500050643491 |
480 |
8.81316932814492 |
17.1495291496596 |
| 2002 |
12.822587108324 |
480 |
8.63576512895314 |
16.2591819746345 |
| 2003 |
12.3261245405957 |
480 |
7.93954804856406 |
16.0735152181235 |
| 2004 |
12.0194897758662 |
480 |
7.99358853686849 |
15.4225805899853 |
| 2005 |
12.821338785799 |
480 |
7.84163907993913 |
16.6677841781874 |
| 2006 |
11.6018527313208 |
480 |
7.89382447700733 |
14.9360326288468 |
| 2007 |
11.9017996448908 |
480 |
7.61485040726817 |
15.4374755542499 |
| 2008 |
10.8493589316913 |
480 |
7.38547899976406 |
13.631417393054 |
| 2009 |
9.79977942850085 |
480 |
6.93395272005311 |
12.2516643936629 |
| 2010 |
9.8990843934105 |
480 |
6.67914379190667 |
13.0338593807935 |
| 2011 |
9.74826315062497 |
480 |
6.82237065360047 |
12.2010814273773 |
| 2012 |
9.10441050111972 |
480 |
6.65275616728418 |
11.2006894438061 |
| 2013 |
8.89536258052486 |
480 |
6.43337097897599 |
11.0856827490263 |
| 2014 |
8.79213649558373 |
480 |
6.08991911464476 |
11.121495964418 |
| 2015 |
8.49430698924954 |
480 |
6.05672366310923 |
10.6210590187084 |