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Air Quality <br />Table 2. Federal and state air quality standards. <br /> National Ambient Air Quality Standards <br /> Primary Secondary Oregon Standards <br />Criteria Pollutants (µg/m3) <br />Nitrogen oxides (annual average) 1008 (0.053 ppm) 1008 (0.053 ppm) 1008 <br />Sulfur dioxide <br />Annual 808 (0.03 ppm) - 538 <br />24-hour average 365b (0.14 ppm) - 260b <br />3-hour average - 1,300b (0.50 ppm) 1,300b <br />Carbon monoxide <br />8-hour average 10,000b (9 ppm) - 10,000b <br />1-hour average 40,000b (35 ppm) - 40,000b <br />Ozone (1-hour average) 235b (0.12 ppm) 235b (0.12 ppm) 235b <br />Fugitive Dust (µg/m3) <br />Total suspended particulates <br />Annual geometric mean - - 608 <br />24-hour average - - 150b <br />Inhalable particulate matter (PMIO) <br />Annual arithmetic mean 50 50 50 <br />24-hour average 150b 150b ISOb <br />8 Never to be exceeded. <br />b Not to be exceeded more than once per year. <br />µg/m3 =micrograms per cubic meter. <br />ppm =parts per million. <br />The Lane Regional Air Pollution Authority measures three criteria pollutants: inhalable <br />particulate matter (PMIO), carbon monoxide (CO), and ozone (03) in the Eugene/Springfield <br />area. The Eugene/Springfield area is an attainment area for all criteria air quality pollutants, with <br />the exception of the PMIO 24-hour standards. Carbon monoxide levels in the Eugene/ <br />Springfield area have been in attainment since 1985. The ozone standard was last exceeded in <br />1988. The national ambient air quality standards (NAAQS) allow for one 8-hour exceedance of <br />carbon monoxide per calendar year. In the Eugene/Springfield area, ozone has not exceeded the <br />standard since 1981. The standard for ozone allows cone-hour exceedance per calendar year in <br />any 3-year period, without designating the area as a nonattainment area. <br />Significant Adverse Impacts <br />All existing structures on the site selected for construction of the courthouse would be <br />demolished before the new courthouse is constructed. Demolition activities would create <br />fugitive dust emissions, and heavy machinery operation would produce emissions of criteria <br />pollutants including carbon monoxide and nitrogen oxides. These impacts from demolition <br />would be short-term and would not interfere with attainment or maintenance of long-term air <br />quality standards. <br />New Federal Courthouse 89 Final EIS <br />