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4.1 – Air Quality <br />Draft Environmental Impact Report February 2021 <br />14800 W. Schulte Road Logistics Center 4.1-10 <br />Table 4.1-1. Ambient Air Quality Standards <br />Pollutant Averaging Time <br />California Standardsa National Standardsb <br />Concentrationc Primaryc,d Secondaryc,e <br />SO2h 1 hour 0.25 ppm (655 g/m3) 0.075 ppm <br />(196 g/m3) <br />— <br />3 hours — — 0.5 ppm <br />(1,300 g/m3) <br />24 hours 0.04 ppm (105 g/m3) 0.14 ppm <br />(for certain areas)g <br />— <br />Annual — 0.030 ppm <br />(for certain areas)g <br />— <br />PM10i 24 hours 50 g/m3 150 g/m3 Same as Primary <br />Standard Annual Arithmetic <br />Mean <br />20 g/m3 — <br />PM2.5i 24 hours — 35 g/m3 Same as Primary <br />Standard <br />Annual Arithmetic <br />Mean <br />12 g/m3 12.0 g/m3 15.0 g/m3 <br />Leadj,k 30-day Average 1.5 g/m3 — — <br />Calendar Quarter — 1.5 g/m3 <br />(for certain areas)k <br />Same as Primary <br />Standard <br />Rolling 3-Month <br />Average <br />— 0.15 g/m3 <br />Hydrogen <br />sulfide <br />1 hour 0.03 ppm (42 µg/m3) — — <br />Vinyl <br />chloridej <br />24 hours 0.01 ppm (26 µg/m3) — — <br />Sulfates 24- hours 25 µg/m3 — — <br />Visibility <br />reducing <br />particles <br />8 hour (10:00 a.m. <br />to 6:00 p.m. PST) <br />Insufficient amount to <br />produce an extinction <br />coefficient of 0.23 per <br />kilometer due to the <br />number of particles when <br />the relative humidity is <br />less than 70% <br />— — <br />Source: CARB 2016c. <br />g/m3 = micrograms per cubic meter; mg/m3= milligrams per cubic meter; ppm = parts per million by volume; O3 = ozone; NO2 = <br />nitrogen dioxide; CO = carbon monoxide; SO2 = sulfur dioxide; PM10 = particulate matter with an aerodynamic diameter less than or <br />equal to 10 microns; PM2.5 = particulate matter with an aerodynamic diameter less than or equal to 2.5 microns. <br />a California standards for O3, CO, SO2 (1-hour and 24-hour), NO2, suspended particulate matter (PM10, PM2.5), and visibility-reducing <br />particles are values that are not to be exceeded. All others are not to be equaled or exceeded. CAAQS are listed in the Table of <br />Standards in Section 70200 of Title 17 of the California Code of Regulations. <br />b National standards (other than O3, NO2, SO2, particulate matter, and those based on annual averages or annual arithmetic mean) <br />are not to be exceeded more than once per year. The O3 standard is attained when the fourth highest 8-hour concentration <br />measured at each site in a year, averaged over 3 years, is equal to or less than the standard. For PM10, the 24-hour standard is <br />attained when the expected number of days per calendar year with a 24-hour average concentration above 150 µg/m3 is equal <br />to or less than 1. For PM2.5, the 24-hour standard is attained when 98% of the daily concentrations, averaged over 3 years, are <br />equal to or less than the standard. <br />c Concentration expressed first in units in which it was promulgated. Equivalent units given in parentheses are based on a reference <br />temperature of 25°C and a reference pressure of 760 torr. Most measurements of air quality are to be corrected to a reference <br />temperature of 25°C and a reference pressure of 760 torr; ppm in this table refers to ppm by volume, or micromoles of pollutant <br />per mole of gas. <br />d National Primary Standards: The levels of air quality necessary, with an adequate margin of safety, to protect the public hea lth.