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5.1 AIR QUALITY <br /> 0.21 <br /> 0.18 - - - - - - - - - - - - - - - - - - - - - - - <br /> 0.15 <br /> c <br /> 0 <br /> E 0.12 <br /> L <br /> d <br /> yQ ♦ ♦ <br /> L ♦ <br /> M. 0.09 <br /> O <br /> z <br /> 0.06 <br /> ♦ <br /> 0.03 Max Hourly Concentration <br /> 3-Year Average <br /> California Standard <br /> 0.00 <br /> 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 <br /> Calendar Year <br /> FIGURE 5.1-4 <br /> Maximum 1-hour NO2 Level: Stockton-Hazelton: 1995-2007 <br /> 5.1.1.3.5 Carbon Monoxide <br /> CO is a product of incomplete combustion,principally from automobiles and other mobile <br /> sources of pollution. In many areas of California, CO emissions from wood-burning stoves <br /> and fireplaces can also be measurable contributors to high ambient levels of CO. Industrial <br /> sources typically contribute less than 10 percent of ambient CO levels. Peak CO levels occur <br /> typically during winter months, due to a combination of higher emission rates and stagnant <br /> weather conditions. For purposes of state and federal air quality planning,the San Joaquin <br /> Valley Air Basin is classified as being in attainment for CO. <br /> Table 5.1-5 shows the California and federal air quality standards for CO,and the maximum <br /> 1-hour and 8-hour average levels recorded at the Stockton-Hazelton monitoring station in <br /> Stockton during the period 1998-2007. <br /> Trends of maximum 8-hour and 1-hour average CO, shown in Figures 5.1-5 and 5.1-6, <br /> respectively, demonstrate that maximum ambient CO levels at Stockton have been below the <br /> state and federal standards since 1995. <br /> SAC/371322/082410013(LEC_5.1_AIR_QUALITY.DOC) 5.1-11 <br />