Weekend/Weekday Ozone Observations in the South Coast Air Basin
Weekend/Weekday Ozone Observations in the South Coast Air Basin
Weekend/Weekday Ozone Observations in the South Coast Air Basin
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250<br />
200<br />
150<br />
100<br />
50<br />
0<br />
1976<br />
1977<br />
1978<br />
1979<br />
1980<br />
1981<br />
1982<br />
1983<br />
1984<br />
1985<br />
1986<br />
1987<br />
1988<br />
1989<br />
1990<br />
1991<br />
1992<br />
1993<br />
1994<br />
1995<br />
1996<br />
1997<br />
1998<br />
1999<br />
Number of Exceedances<br />
1980's<br />
1990's<br />
Year<br />
Figure 2.1-1. Trend <strong>in</strong> number of annual exceedances of <strong>the</strong> federal 1-hour ozone standard <strong>in</strong> <strong>the</strong><br />
<strong>South</strong> <strong>Coast</strong> <strong>Air</strong> Bas<strong>in</strong> from 1976 to 1999.<br />
Ave Max 1-Hr O3 (ppm)<br />
0.5<br />
0.4<br />
0.3<br />
0.2<br />
0.1<br />
Western Central Eastern<br />
0.0<br />
1980<br />
1981<br />
1982<br />
1983<br />
1984<br />
1985<br />
1986<br />
1987<br />
1988<br />
1989<br />
1990<br />
1991<br />
1992<br />
1993<br />
1994<br />
1995<br />
1996<br />
1997<br />
1998<br />
1999<br />
Year<br />
Figure 2.1-2. Trends <strong>in</strong> average maximum 1-hour ozone from 1980 to 1997 <strong>in</strong> <strong>the</strong> western,<br />
central and eastern portions of <strong>the</strong> <strong>South</strong> <strong>Coast</strong> <strong>Air</strong> Bas<strong>in</strong>. Monitor<strong>in</strong>g sites <strong>in</strong>cluded <strong>in</strong> <strong>the</strong><br />
averages are Los Angeles–N. Ma<strong>in</strong>, Lynwood, N. Long Beach, Anaheim, and La Habra, for<br />
Western, Azusa, Glendora, Pomona, and Upland for Central, and Riverside and Lake Gregory<br />
for Eastern.<br />
2-13
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