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4.1 – Air Quality <br />Draft Environmental Impact Report February 2021 <br />14800 W. Schulte Road Logistics Center 4.1-22 <br />Table 4.1-3. Local Ambient Air Quality Data <br />Monitoring <br />Station Unit <br />Averaging <br />Time <br />Agency/ <br />Method <br />Ambient <br />Air <br />Quality <br />Standard <br />Measured <br />Concentration by Year Exceedances by Year <br />2016 2017 2018 2016 2017 2018 <br />Fine Particulate Matter (PM2.5)a <br />Stockton g/m3 Maximum <br />24-hour <br />concentration <br />National 35 28.5 47.9 257.5 — — — <br />g/m3 Annual <br />concentration <br />California 12 — — — — — — <br />National 12.0 11.7 12.2 17.6 — — — <br />Sources: CARB 2021; EPA 2020. <br />Notes: — = not available; g/m3 = micrograms per cubic meter; ppm = parts per million <br />Data taken from CARB iADAM (http://www.arb.ca.gov/adam) and EPA AirData (https://www.epa.gov/outdoor -air-quality-data) <br />represent the highest concentrations experienced over a given year. <br />Exceedances of national and California standards are only shown for O 3 and particulate matter. Daily exceedances for particulate <br />matter are estimated days because PM10 and PM2.5 are not monitored daily. All other criteria pollutants did not exceed national or <br />California standards during the years shown. There is no national standard for 1-hour O3, annual PM10, or 24-hour SO2, nor is there a <br />California 24-hour standard for PM2.5. <br />SO2 is not currently monitored in the County and data is not available; therefore, it is not included in the table. <br />Tracy Monitoring Station is located at 5749 South Tracy Boulevard, Tracy, California 95377. <br />Stockton Monitoring Station is located 1593 East Hazelton Avenue, Stockton, California 95205. <br />a Measurements of PM 10 and PM 2.5 are usually collected every 6 days and every 1 to 3 days, respectively. Number of days <br />exceeding the standards is a mathematical estimate of the number of days concentrations wo uld have been greater than <br />the level of the standard had each day been monitored. The numbers in parentheses are the measured number of samples <br />that exceeded the standard. <br />4.1.3 Thresholds of Significance <br />The significance criteria used to evaluate a project’s impacts to air quality are based on Appendix G of the CEQA <br />Guidelines. According to Appendix G of the CEQA Guidelines, a significant impact related to air quality would occur <br />if a project would: <br />A. Conflict with or obstruct implementation of the applicable air quality plan. <br />B. Result in a cumulatively considerable net increase of any criteria pollutant for which the Project region is <br />non-attainment under an applicable federal or state ambient air quality standard. <br />C. Expose sensitive receptors to substantial pollutant concentrations. <br />D. Result in other emissions (such as those leading to odors) adversely affecting a substantial number <br />of people . <br />E. Result in cumulatively considerable air quality impacts. <br />Appendix G of the CEQA Guidelines (14 CCR 15000 et seq.) indicates that, where available, the significance criteria <br />established by the applicable air quality management district or air pollution control district may be relied upon to <br />determine whether a project would have a significant impact on air quality.