PM10 (ug/m3) 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 Max. 24-Hour Concentration 146 150 173 155 112 101 97 74 76 95 92 114 Max. Annual Geometric Mean 34.6 34.4 33 31.5 29.5 25.1 24.8 22.1 22.1 23.7 22.5 25.4 Calc Days Above State 24-Hr Std 78 84 72 90 78 48 42 24 12 18 18 36 Calc Days Above Nat 24-Hr Std 0 0 6 3 0 0 0 0 0 0 0 0