Chapter 4 PM10 Air Quality Table Table 4-32 PM10 (ug/m3) 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 Max. 24-Hr. Concentration (State) 206 237 439 279 186 239 192 279 153 199 167 186 153 221 194 150 Max. 24-Hr. Concentration (Nat) 244 250 439 279 183 239 190 279 153 199 160 183 145 205 189 150 Annual Average (State) 52.7 67 80.1 70 62.4 56.3 49.6 57.9 54.1 47.3 40.5 60.1 53.9 52.3 59.9 52.3 Annual Average (Nat) 67.4 79.3 79.3 69.9 62.9 56.3 50.1 58.2 54.1 48.2 39.9 59.5 53.1 57.4 59.2 52.4 Calc Days Above State 24-Hr Std 300 302 313 285 273 233 253 246 225 188 185 216 237 236 267 242 Calc Days Above Nat 24-Hr Std 40 40 56 40 3 11 8 8 0 3 6 12 0 12 8 0