Chapter 4 PM2.5 Air Quality Table Table 4-22 PM25 (ug/m3) 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 Max. 24-Hr. Concentration (State) 90.5 67.2 107.5 84.5 56.1 73.7 54.6 Max. 24-Hr. Concentration (Nat) 90.5 67.2 107.5 76.7 56.1 73.7 54.6 98th Percentile of 24-Hr Conc. 55.3 85.6 62.3 37.4 42.2 39.8 Annual Average (State) 11.6 12.9 14.0 11.7 11.6 11.8 Avg. of Qtrly. Means (Nat) 16.8 13.6 12.8 14.0 11.7 11.6 11.8