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4.5 AIR QUALITY <br /> TABLE 4.5-1 <br /> AMBIENT AIR QUALITY STANDARDS <br /> Federal <br /> Averaging Primary State <br /> Pollutant Time Standard' Standard <br /> Ozone 1-hour 0.12 ppm 0.09 ppm <br /> Carbon Monoxide 8-hour 9.0 ppm 9.0 ppm <br /> 1-hour 35.0 ppm 20.0 ppm <br /> Nitrogen Dioxide annual 0.05 ppm -- <br /> 1-hour -- 0.25 ppm <br /> Sulfur Dioxide annual 0.03 ppm -- <br /> 24-hour 0.14 ppm 0.25 ppm <br /> 1-hour -- 0.5 ppm <br /> PM-10 annualb 50.0 µg/m' 30.0 µg/m3 <br /> 24-hour 150.0 µg/m' 50.0 µg/m3 <br /> Lead 30-day avg. -- 1.5 µg/m3 <br /> 3-month avg. 1.5 µg/m' -- <br /> " Federal primary standards are designed to protect public health. The secondary <br /> standards are to protect the public welfare from other effects such as soiling and <br /> visibility reduction. <br /> b The state PM-10 standard is for the geometric mean of all measurements. The <br /> federal standard is based upon the arithmetic mean of all measurements. <br /> Notes: ppm = Parts per million. <br /> --= Not available. <br /> µg/m3 = Micrograms per cubic meter. <br /> 4.5-2 <br />