National Trends in PM10 Concentrations in 1990 - 2012
Year Mean Number of Trend Sites 10th Percentile 90th Percentile
1990 84.3598326359832 239 44 142
1991 82.2384937238493 239 43 134
1992 73.1269177126917 239 41 115
1993 71.2475592747559 239 41 108
1994 70.5 239 39 108
1995 69.9728033472803 239 39 120
1996 63.9581589958159 239 36 104
1997 64.4518828451882 239 36 106
1998 62.2914923291492 239 37 99
1999 67.5746164574616 239 37 109
2000 64.4309623430962 239 36 102
2001 63.7782426778242 239 36 100
2002 62.6422594142259 239 37 96
2003 65.1485355648535 239 34 113
2004 55.4895397489539 239 32 85
2005 59.5648535564853 239 34 92
2006 59.0627615062761 239 33 95
2007 61.1004184100418 239 35 94
2008 57.2803347280334 239 32 91
2009 51 239 27 80
2010 51.4058577405857 239 29 79
2011 54.2175732217573 239 28 87
2012 51.602510460251 239 28 86