National Trends in PM10 Concentrations in 1990 - 2010
Year Mean Number of Trend Sites 10th Percentile 90th Percentile
1990 82.663082437276 279 43 135
1991 80.5232974910394 279 43 132
1992 72.4384707287933 279 41 115
1993 70.4617682198327 279 41 108
1994 69.4569892473118 279 39 107
1995 68.5513739545997 279 39 115
1996 63.3333333333333 279 36 101
1997 63.7706093189964 279 36 105
1998 61.9468339307049 279 37 96
1999 67.1409796893668 279 37 109
2000 64.3440860215053 279 36 102
2001 63.4874551971326 279 36 100
2002 63.094982078853 279 37 95
2003 64.331541218638 279 33 113
2004 54.9856630824372 279 31 86
2005 59.0931899641577 279 33 90
2006 58.3440860215053 279 33 93
2007 60.5364396654719 279 34 94
2008 56.2664277180406 279 33 88
2009 50.6236559139785 279 28 79
2010 51.0215053763441 279 29 78