Northern Rockies Trends in PM25 Concentrations in 2000 - 2015
| Year |
Mean |
Number of Trend Sites |
10th Percentile |
90th Percentile |
| 2000 |
9.3366984455609 |
19 |
5.57606048166393 |
13.5065749863164 |
| 2001 |
8.84244683305808 |
19 |
5.02830515297906 |
11.0467533370412 |
| 2002 |
8.40315861167146 |
19 |
4.68801282051282 |
10.6820658677366 |
| 2003 |
8.84766229248775 |
19 |
5.20528846153846 |
10.4520612648221 |
| 2004 |
8.20045323717688 |
19 |
5.00293650793651 |
10.0657019704432 |
| 2005 |
8.72209260579853 |
19 |
4.33995535714286 |
11.0704663944229 |
| 2006 |
8.29694496835426 |
19 |
4.76052083333333 |
10.7773388305847 |
| 2007 |
8.25003445553073 |
19 |
4.66006810897435 |
12.8261131636563 |
| 2008 |
7.91603702665775 |
19 |
4.55961538461538 |
10.090085978836 |
| 2009 |
7.58272977574613 |
19 |
3.96645195902186 |
9.79830803615286 |
| 2010 |
8.40697411648264 |
19 |
4.21409343715239 |
11.3038440860215 |
| 2011 |
7.7710568796677 |
19 |
4.125625 |
11.6804944828722 |
| 2012 |
7.91833017789875 |
19 |
4.44333333333333 |
11.2669390679706 |
| 2013 |
7.54127652381249 |
19 |
4.6690625 |
10.940676079085 |
| 2014 |
6.70502403076251 |
19 |
4.2500856099763 |
9.1089717438029 |
| 2015 |
7.1615041311412 |
19 |
4.4052910977911 |
10.4771603396603 |