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8.B. - Page 32 <br /> 4.3 AIR QUALITY <br /> 4.3.1 Settin� <br /> 4.3.1.1 Regional Air Quality <br /> Air quality and the amount of a given pollutant in the atmosphere are determined by the amount of a <br /> pollutant released and the atmosphere's ability to transport and dilute the pollutant. The major <br /> determinants of transport and dilution are wind, atmospheric stability,terrain and for photochemical <br /> pollutants, sunshine. <br /> The Bay Area typically has moderate ventilation, frequent inversions that restrict vertical dilution, <br /> and terrain that restricts horizontal dilution. These factors give the Bay Area a relatively high <br /> atmospheric potential for pollution. <br /> The Bay Area Air Quality Management District(BAAQMD) monitors air quality at several locations <br /> within the San Francisco Bay Air Basin. The Bay Area has attained carbon mono�de standards. As <br /> shown in Table 1,the only violations of State and Federal standards at the Redwood City monitoring <br /> station during the 2007-2009 period(the most recent years for which data is available)were high <br /> levels of PMio and PM2.5.4 <br /> TABLE 1 <br /> Number of Ambient Air Quality Standards Violations <br /> and Highest Concentrations (2007-2009)s <br /> Pollutant Standard Da s Exceedin Standard <br /> 2007 2008 2009 <br /> REDWOOD CITY STATION <br /> Ozone State 1-hour 0 0 0 <br /> Federal8-hour 0 0 0 <br /> Carbon Mono�de Federal 8-hour 0 0 0 <br /> State 8-hour 0 0 0 <br /> Nitrogen Dio�de State 1-hour 0 0 0 <br /> Federa124-hour 0 n/a6 n/a <br /> pMio <br /> State 24-hour 1 n/a n/a <br /> PMz.s Federa124-hour 1 0 0 <br /> Source: Bay Area Management District,Bay Area Air Pollution Summary <br /> The pollutants known to exceed the State and Federal standards in the project area are regional <br /> pollutants. Ozone and PM2.5 are considered regional pollutants because the concentrations are not <br /> determined by proximity to individual sources,but rather show a relative uniformity over a region. <br /> 4 PM refers to Particulate Matter. Particulate matter is referred to by size(i.e., 10 or 2.5)because the size of <br /> particles is directly linked to their potential for causing health problems. <br /> s Bay Area Air Quality Management District. Annual Bay Area Air Quality Summaries. <br /> <http://www.baaqmd.gov/Divisions/Cominunications-and-Outreach/Air-Oualitv-in-the-Bav-ArealAir-Oualit� <br /> Summaries.asUx>Accessed June 29,2011. <br /> 6 PMio monitoring was discontinued at the Redwood City monitoring station in June 2008. There is no data <br /> available for 2008 or 2009. <br /> 1410 Valota Road Residential Project 20 Initial Study <br /> Redwood City January 2012 <br />