Number of Days Exceeding Standards in 1995
In recent years the South Coast Air Basin has been the worst location in the U.S. in terms of the annual number of days exceeding the federal standards. In 1995, there were 116 days on which one or more federal standards were exceeded somewhere in the Basin. Figure 2 shows the percent of days exceeding each of the federal or state standards in 1995 at the individual locations which recorded the greatest number of exceedances. The federal ozone standard was exceeded on 73 days (20% of days) in the East San Gabriel Valley. The carbon monoxide standard was exceeded most frequently in the South Central Los Angeles County area, which recorded 13 days (4% of days) exceeding. PM10 concentrations are normally only sampled every sixth day, and exceedances are accordingly reported in terms of percent of days sampled. In 1995, the Metropolitan Riverside County area exceeded the federal PM10 standard most frequently, with 6.6% of days sampled exceeding. The Metropolitan Riverside County area was the only area to exceed the sulfate standard with 1.6% of days sampled exceeding.
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