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4.1 – Air Quality Draft Environmental Impact Report February 2021 14800 W. Schulte Road Logistics Center 4.1-21 Local Ambient Air Quality CARB, air districts, and other agencies monitor ambient air quality at approximately 250 air quality monitoring stations across the state. The SJVAPCD and CARB monitor local ambient air quality at the Project site. Air quality monitoring stations usually measure pollutant concentrations 10 feet above ground level; therefore, air quality is often referred to in terms of ground-level concentrations. The most recent background ambient air quality data from 2016 to 2018 are presented in Table 4.1-3. The Tracy monitoring station, located at 5749 South Tracy Boulevard, Tracy, California 95377, is the nearest air quality monitoring station to the Project site, located approximately 3.3 miles southeast of the Project site. The data collected at this station are considered representative of the air quality experienced in the Project vicinity. Air quality data for O3, NO2, and PM10 from the Tracy monitoring station are provided in Table 4.1-3. Because CO and PM2.5 are not monitored at the Tracy monitoring station, CO and PM2.5 measurements were taken from the Stockton monitoring station (1593 East Hazelton Avenue, Stockton, California 95205, approximately 19.8 miles northeast of the Project site). SO2 is not currently monitored in the County and data is not available. The number of days exceeding the ambient air quality standards are also shown in Table 4.1-3. Table 4.1-3. Local Ambient Air Quality Data Monitoring Station Unit Averaging Time Agency/ Method Ambient Air Quality Standard Measured Concentration by Year Exceedances by Year 2016 2017 2018 2016 2017 2018 Ozone (O3) Tracy ppm Maximum 1-hour concentration California 0.09 0.109 0.093 0.099 4 0 1 ppm Maximum 8-hour concentration California 0.070 0.092 0.082 0.081 19 5 8 National 0.070 0.092 0.082 0.081 19 5 8 Nitrogen Dioxide (NO2) Tracy ppm Maximum 1-hour concentration California 0.18 0.028 0.040 0.048 0 0 0 National 0.100 0.028 0.041 0.049 0 0 0 ppm Annual concentration California 0.030 0.048 0.050 0.056 — — — National 0.053 0.048 0.050 0.056 — — — Carbon Monoxide (CO) Stockton ppm Maximum 1-hour concentration California 20 1.7 2.2 3 0 0 0 National 35 1.7 2.2 3 0 0 0 ppm Maximum 8-hour concentration California 9.0 1.3 1.9 2.7 0 0 0 National 9 1.3 1.9 2.7 0 0 0 Coarse Particulate Matter (PM10)a Tracy g/m3 Maximum 24-hour concentration California 50 53.0 152.0 250.2 0.0 (0) 0.0 (0) 2.0 (2) National 150 52 151 249 0.0 (0) 0.0 (0) 2.0 (2) g/m3 Annual concentration California 20 — — — — — —