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City of Pleasanton—Hidden Canyon Residences and Preserve <br />Air Quality Draft EIR <br /> <br /> <br />3.2-10 FirstCarbon Solutions <br />https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480016/EIR/3 - Draft EIR/21480016 Sec03-02 Air Quality.docx <br />Table 3.2-2: Ambient Air Quality Standards <br />Air Pollutant Averaging Time <br />California <br />Standard1 <br />Concentration <br />National Standard <br />Concentration State Status National Status <br />Ozone 8 Hour 0.070 ppm 0.070 ppm Nonattainment Nonattainmen <br />t 1 Hour 0.09 ppm — <br />CO (carbon <br />monoxide) <br />8 Hour 9 ppm 9 ppm Attainment Attainment 1 Hour 20 ppm 35 ppm <br />NO2 (nitrogen <br />dioxide) <br />1 Hour 0.18 ppm 0.100 ppm Attainment Attainment Annual 0.030 ppm 0.053 ppm <br />SO2 (sulfur <br />dioxide) <br />24 Hours 0.04 ppm 0.14 ppm <br />Attainment Attainment 1 Hour 0.25 ppm 0.075 ppm <br />Annual — 0.030 ppm <br />Particulate matter <br />(PM10) <br />Annual <br />Arithmetic Mean <br />20 µg/m3 — <br />Nonattainment Unclassified <br />24 hours 50 µg/m3 150 µg/m3 <br />Particulate matter <br />(PM2.5) <br />Annual <br />Arithmetic Mean <br />12 µg/m3 9 µg/m3 <br />Nonattainment Nonattainmen <br />t 24 Hours — 35 µg/m3 <br />Sulfates 24 Hours 25 µg/m3 — Attainment N/A <br />Lead Quarter — 1.5 µg/m3 <br />Unclassified N/A Rolling 3-month <br />average <br />— 0.15 µg/m3 <br />30 days 1.5 µg/m3 — <br />Hydrogen sulfide 1 Hour 0.03 ppm — Unclassified N/A <br />Vinyl chloride 24 Hours 0.01 ppm — N/A Attainment <br />Notes: <br />ppm = parts per million <br />µg/m3 = micrograms per cubic meter <br /> <br />Source: California Air Resources Board (ARB). 2024. Table of Ambient Air Quality Standards. <br />California Air Resources Board (ARB). 2024. Ambient Air Quality Standards Designation Tool. <br />United States Environmental Protection Agency (EPA). 2024. Nonattainment Areas for Criteria Pollutants (Green Book). <br /> <br />The current attainment designations for the Air Basin are shown in Table 3.2-3. Currently in the <br />SFBAAB, 8-hour average ozone (both State and national), 1-hour average ozone (State), annual <br />arithmetic mean PM10 (State), 24-hour average PM10 (State), annual arithmetic mean PM2.5 (State), <br />and 24-hour average PM2.5 (national) are still in nonattainment status.