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<br />The existing air quality is typical of undeveloped regions in the western <br />United States; ambient pollutant levels are usually near or below measurable <br />limits. Notable e.KCeptions in the region include high, short-term <br />concentrations of total suspended particulates (TSP), non-methane <br />hydrocarbons (NMHC), and carbon monoxide (CO) in nearby towns (BLM 1983). <br />The project area is rated a Class II area for air quality, consistent with <br />the majority of the remainder of the state (BLM 1983). Class II areas have <br />specified allowable increases (increments) of pollutants which may never <br />exceed a given standard (ambient standard). <br />Concentrations of air pollutants reported for the region of the project area <br />are shown in Table K-1. <br />Table K-1 TYPICAL POLLUTANT LEVELS FOR PROJECT AREA <br />(In Micrograms Per Cubic Meter) <br />• <br />• <br />Pollutant Annual Average <br />1-Hour Average <br />TSP <br />S02 <br />N02 <br />0~ <br />Source: BLM 1983 <br />10 to 40 <br />0.3 to 3 <br />2 to 3U <br />24-Hour Average <br />80 to 130 <br />50 to 130 <br />Air quality monitoring on-site, as well as at nearby <br />tracts) indicates that the pollutants generated are <br />ranges, with some short-term exceedences (BLM 1983). <br />118 to 160 <br />1000 to 2300 <br />locations (C-a, C-b <br />within acceptable <br />K-2 <br />