Chapter 4 PM10 Air Quality Table Table 4-61 PM10 (ug/m3) 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 Max. 24-Hr. Concentration (State) 100 147 153 136 111 113 154 145 98 126 130 179 90 112 96 123 171 Max. 24-Hr. Concentration (Nat) 115 139 153 136 111 110 154 145 98 126 130 179 86 105 92 81 169 Annual Average (State) 41.9 38.5 39.2 35.2 31.2 33.3 29.9 29.9 28.8 29.9 39.4 27.9 30.5 31.8 28.8 43.2 Annual Average (Nat) 42.8 41.9 41.7 42.3 34.7 31.8 34.5 30.1 29.8 28.6 29 38.4 27.9 30.2 30.9 28.4 42.6 Calc Days Above State 24-Hr Std 183 134 175 189 177 92 108 108 129 65 97 144 81 102 126 66 195 Calc Days Above Nat 24-Hr Std 0 0 0 0 0 0 0 0 0 0 0 6 0 0 0 0 6