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3.0 ENVIRONMENTAL CHECKLIST <br />small size, these particles can be inhaled and eventually trapped in the bronchial and alveolar <br />regions of the lung. <br />CARB does not classify PM2.5 (fine particulate matter) as a toxic air contaminant. However, the <br />BAAQMD has determined that both long-term and short-term exposure to PM2.5 can cause a wide <br />range of health effects. PM2.5 is a complex mixture of substances that includes elements such as <br />carbon and metals; compounds such as nitrates, organics, and sulfates; and complex mixtures <br />such as diesel exhaust and wood smoke. PM2.5 can be emitted directly and can also be formed <br />in the atmosphere through reactions among different pollutants (BAAQMD 2017a). <br />Ambient Air Quality <br />The US Environmental Protection Agency (EPA) and the State of California have established <br />health -based ambient air quality standards for the criteria pollutants described above, as well as <br />for lead, sulfates, hydrogen sulfide, vinyl chloride, and visibility -reducing particles. Air quality <br />standards are designed to protect the health and welfare of the populace with a reasonable <br />margin of safety. <br />Areas with air quality that exceed adopted air quality standards are designated as nonattainment <br />areas for the relevant air pollutants, while areas that comply with air quality standards are <br />designated as attainment areas. The SFBAAB's current attainment status with regard to federal <br />and state ambient air quality standards is summarized in Table 3.3-2. The region is nonattainment <br />for federal ozone and PM2.5 standards, as well as for state ozone, PMlo, and PM2.5 standards <br />(BAAQMD 2017a). <br />TABLE 3.3-2 <br />FEDERAL AND STATE AMBIENT AIR QUALITY ATTAINMENT STATUS FOR THE <br />SAN FRANCISCO BAY AREA AIR BASIN <br />California Standards <br />National Standards <br />Pollutant <br />Averaging Time <br />Attainment <br />Attainment <br />Concentration <br />Status <br />Concentration <br />Status <br />8 Hours <br />0.070 ppm <br />(137,ag/m ) <br />N <br />0.070 ppm <br />N <br />Ozone (03) <br />1 Hour <br />0.090 ppm <br />N <br />No standard <br />Not <br />(180,ag/m3) <br />applicable <br />8 Hours <br />9.0 ppm <br />A <br />9 ppm <br />A <br />Carbon Monoxide <br />(10 mg/m3) <br />(10 mg/m3) <br />(CO) <br />1 Hour <br />20 ppm <br />A <br />35 ppm <br />A <br />(23 mg/m3) <br />(40 mg/m3) <br />1 Hour <br />(30.1 ppm m3) <br />A <br />0.100 ppm <br />U <br />Nitrogen Dioxide <br />(NO2) <br />Annual Arithmetic Mean <br />. 0030 ppm <br />0.053 ppm <br />A <br />(57 /jg/m3) <br />(100 yg/m3) <br />1388 Bancroft Avenue Project City of San Leandro <br />Initial Study/Mitigated Negative Declaration November 2018 <br />3.0-10 <br />