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<br />Table 2-3 <br />STATE AND FEDERAL AIR QUALITY STANDARDS <br />(micrograms per cubic meter) <br /> <br /> Ambient b Increment C <br /> Averaging' Federal Colorado Federal Colorado 0 <br /> Pollutant Time Primary Secondary Primary Secondary C1ass I C1ass D C1ass m Category I Category D Category DI <;.;.;) <br /> j.o",-~ <br /> -.J <br /> Carbon Monoxide 8 bours 10,000 10,000 10,000 0' <br /> I bour 40,000 40,000 40,000 en <br /> Lead Quarterly 1.5 1.5 <br /> Nitrogen Dioxide Annual <br /> (Arith,) 100 100 100 <br /> Oxidants (Ozone) 1 hour 235 235 160 <br /> Sulfur Dioxide Annual <br /> (Arith,) 80 2 20 40 2 10 15 <br /> 24 hours 365 5 91 182 5 50 100 <br /> 3 hours 1,300 700 25 512 700 25 300 700 <br /> Total Suspended Annual <br />N Particulates (Geom.) 75' 60' 75 60' 5 19 37 <br />, <br />... 24 hours 26ll" 15ll" 260 150 10 37 75 <br /> Inbalable Annual <br /> Particulates (Aritb,) 50 50 <br /> (PM,,) 24-bours 150 150 <br /> <br />Sources: National Primary and Secondary Ambient Air Quality Standards (40 CFR 50 et seq, as revised July I. 1987), <br />Requirements for Preparatiou, Adoption and Submittal of Implementation Plans (40 CFR 51.166, as revised July I, 1987), <br />Approval aud Promulgatiou of Implementation Plans (40 CFR 52.21, as revised July I, 1985), <br />Code of Colorado Regulations (Volume 5, Part 14, as amended May 27. 1980), <br /> <br />. Short-term standards (those other than Annual and Quarterly) are Dot to be exceeded more than once each year, except the Fl~ral ozone and PMIO standards. <br />Under Federal regulations, the "expected number of days'" with Drone or PM10 levels above the standard is not to be exceeded more than once per calendar year. <br /> <br />b Ambient standards are tbe absolute maximum level allowed to protect either public bealth (primary) or welfare (secondary), <br /> <br />C Incremental (Prevention of Significant Deterioration) standards are the maximum incremental amounts of pollutants allowed above the base line in regions of <br />clean air. <br /> <br />d Federal TSP standards were superseded by the Federal PM" standards, effective July 31, 1987, <br /> <br />, The Colorado annual secondary TSP standard was established as a guide in assessing implementation plans to achieve the 24-hour stlDdard, <br /> <br />f Colorado is developing PM" standards at least as striugent as the Federal standards. <br /> <br />== <br /> <br />oU.l.-l........._ <br />