National Trends in PM10 Concentrations in 1990 - 2014
| Year |
Mean |
Number of Trend Sites |
10th Percentile |
90th Percentile |
| 1990 |
85.3523316062176 |
193 |
45 |
142 |
| 1991 |
85.300518134715 |
193 |
45 |
134 |
| 1992 |
74.3385146804835 |
193 |
41 |
115 |
| 1993 |
73.2858376511226 |
193 |
43 |
108 |
| 1994 |
72.4309153713299 |
193 |
39 |
111 |
| 1995 |
72.9732297063903 |
193 |
39 |
125 |
| 1996 |
65.6476683937823 |
193 |
36 |
106 |
| 1997 |
66.860103626943 |
193 |
38 |
111 |
| 1998 |
63.6200345423143 |
193 |
38 |
102 |
| 1999 |
69.6442141623488 |
193 |
37 |
113 |
| 2000 |
66.1917098445595 |
193 |
36 |
105 |
| 2001 |
65.1036269430051 |
193 |
36 |
102 |
| 2002 |
64.3652849740932 |
193 |
37 |
97 |
| 2003 |
66.6476683937823 |
193 |
33 |
120 |
| 2004 |
56.9119170984456 |
193 |
31 |
86 |
| 2005 |
60.8756476683937 |
193 |
34 |
97 |
| 2006 |
61.0310880829015 |
193 |
34 |
100 |
| 2007 |
63.2832469775475 |
193 |
36 |
96 |
| 2008 |
59.0794473229706 |
193 |
34 |
95 |
| 2009 |
52.3989637305699 |
193 |
27 |
83 |
| 2010 |
53.1347150259067 |
193 |
29 |
81 |
| 2011 |
55.9948186528497 |
193 |
30 |
89 |
| 2012 |
53.2279792746114 |
193 |
28 |
89 |
| 2013 |
56.9170984455958 |
193 |
25 |
99 |
| 2014 |
54.7046632124352 |
193 |
26 |
97 |