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<br />Noise and Air Quality Analysis <br />Centerville EA W <br /> <br />climate control and should be constructed to achieve an outdoor-to-indoor noise level <br />reduction of 30 dBA. <br /> <br />3.0 Air Quality Impacts <br /> <br />Carbon monoxide (CO) levels are elevated near roadway intersections due to the <br />emission of this pollutant from the vehicles idling and passing by. The State of Minnesota <br />has ambient CO standards that are designed to protect human health and the environment. <br />The Standards are: <br /> <br />. I-hour average: 30 parts per million (ppm); and <br />· 8-hour average: 9 ppm. <br /> <br />Concentrations near or above these levels are most likely to occur near intersections that <br />have heavy traffic volumes and are severely congested. With the proposed area roadway <br />improvements, severe congestion problems that could cause air quality problems are not <br />expected to develop at the major intersections near the project. <br /> <br />Page 5 <br />