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5.1 AIR QUALITY <br /> 5.1.1.3.4 Nitrogen Dioxide <br /> Atmospheric NO2 is formed primarily from reactions between nitric oxide (NO) and oxygen <br /> or ozone. NO is formed during high temperature combustion processes,when the nitrogen <br /> and oxygen in the combustion air combine. Although NO is much less harmful than NO2,it <br /> can be converted to NO2 in the atmosphere within a matter of hours, or even minutes,under <br /> certain conditions. For purposes of state and federal air quality planning,the San Joaquin <br /> Valley Air Basin is in attainment for NO2. <br /> Table 5.1-4 shows the annual maximum one-hour NO2 levels recorded at the Stockton- <br /> Hazelton monitoring station in Stockton from 1998 through 2007, as well as the annual <br /> average level for each of those years. During this period,there have been no violations of <br /> either the state 1-hour standard (0.18 ppm) or the federal annual average standard <br /> (0.053 ppm). Figure 5.1-4 shows the trend from 1995 through 2007 of maximum 1-hour NO2 <br /> levels at Stockton. These levels have been well below the state standard for many years. <br /> TABLE 5.1-4 <br /> Nitrogen Dioxide Levels at Stockton-Hazelton,Stockton, 1998-2007,(parts per million) <br /> 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 <br /> Highest 1-hour Average 0.102 0.106 0.099 0.084 0.076 0.088 0.079 0.087 0.072 0.070 <br /> Annual Average 0.023 0.024 0.021 0.019 0.021 0.018 0.017 0.017 0.018 0.016 <br /> Number of Exceeding: <br /> State Standard (days) 0 0 0 0 0 0 0 0 0 0 <br /> (0.18 ppm, 1-hour) <br /> Federal Standard (years) 0 0 0 0 0 0 0 0 0 0 <br /> (0.053 ppm, annual) <br /> Source: California Air Quality Data,Annual Summary, California Air Resources Board, and AIRData, EPA <br /> 5.1-10 SAC/3713221082410013(LEC_5.1_AIR_QUALITY.DOC) <br />