*Percent of state standard for sulfate and sulfur dioxide.
**Higher concentrations were recorded at special monitoring sites located immediately dowmwind of stationary sources of lead.
*Percent of state standard for sulfate and sulfur dioxide.
**Higher concentrations were recorded at special monitoring sites located immediately dowmwind of stationary sources of lead.
Maximum pollutant concentrations in the Basin continued to exceed the federal standards for ozone, carbon monoxide and PM10 by a wide margin. Figure 1 shows the 1995 Basin maximum pollutant concentrations as percentages of the federal standards compared to maxima for the previous three years. The maximum 1-hour average ozone concentration in 1995 (0.26) was 200% of the federal standard, lower than the previous three years. The highest 8-hour average carbon monoxide concentration of the year (13.9 ppm) was 145% of the federal standard. Maximum 24-hour average and annual average PM10 concentrations (219 µg/m3 and 69.0 µg/m3) were 145% and 138% of the federal 24-hour and annual standards. The highest 24-hour average sulfate in 1995 (26.3 µg/m3) was 105% of the state standard. (There is no federal sulfate standard.)
The federal nitrogen dioxide standard was not exceeded in 1995, with a maximum concentration (0.0464 ppm) which was 87% of the standard. The more stringent state standard was not exceeded either, with a maximum 1-hour average nitrogen dioxide concentration (0.24 ppm) which was 92% of the standard. Sulfur dioxide concentrations continued to remain well below the federal and state standards. Federal and state lead standards were not exceeded in 1995.
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