Laserfiche WebLink
Historical data from the area was used to characterize existing conditions in the vicinity of the Project <br />area. Table 2 shows pollutant levels, State and federal standards, and the number of exceedances <br />recorded in the area from 2019 through 2021. The one -hour State standard for 03 was exceeded twice <br />during this three-year period. The federal standard was exceeded once in that same period. In addition, <br />the daily State standard for PM,owas exceeded twice. The daily federal standard for PM2.5 was exceeded <br />four times. CO and NO2 levels did not exceed the CAAQS from 2019 to 2021 for 1-hour (and 8-hour for <br />CO). <br />Table 2 <br />Ambient Air Quality Data <br />Pollutants and State and Federal Standards <br />Maximum Concentrations and Frequencies <br />of Exceedance Standards <br />2019 <br />2020 <br />2021 <br />Ozone (03) <br />Maximum 1-hour Concentration (ppm) <br />0.0096 <br />0.142 <br />0.089 <br />Days > 0.09 ppm (State 1-hour standard) <br />1 <br />6 <br />0 <br />Days > 0.070 ppm (Federal 8-hour standard) <br />1 <br />15 <br />0 <br />Carbon Monoxide (CO2) <br />Maximum 1-hour Concentration (ppm) <br />2.4 <br />2.3 <br />2.1 <br />Days > 20 ppm (State 1-hour standard) <br />0 <br />0 <br />0 <br />Maximum 8-hour Concentration (ppm) <br />1.3 <br />1.8 <br />1.5 <br />Days > 9.0 ppm (State 8-hour standard) <br />0 <br />0 <br />0 <br />Nitrogen Dioxide (NO2) <br />Maximum 1-hour Concentration (ppm) <br />0.0594 <br />0.0709 <br />0.0671 <br />Days > 0.18 ppm (State 1-hour standard) <br />0 <br />0 <br />0 <br />PM10 <br />Maximum 24-hour Concentration (pg/m3) <br />127 <br />120 <br />115 <br />Days > 50 pg/m3 (State 24-hour standard) <br />13 <br />13 <br />12 <br />PM2.5 <br />Maximum 24-hour Concentration (pg/m3) <br />36.1 <br />41.4 <br />54.4 <br />Days > 35 pg/m3 (Federal 24-hour standard) <br />3 <br />1 <br />9 <br />Sulfur Dioxide (S02) <br />Maximum 24-hour Concentration (ppb) <br />N/A <br />N/A <br />N/A <br />Days > 0.04 ppm (State 24-hour standard) <br />N/A <br />N/A <br />N/A <br />ppm = parts by volume per million of air. <br />pg/m3 = micrograms per cubic meter. <br />N/A = not available at this monitoring station. <br />Source: SCAQMD annual monitoring data at Central Orange County subregion (http://www.agmd.gov/home/air-quality/air-quality-data- <br />studies/historical-data-by-year) accessed July 26, 2023. <br />Cabrillo Town Center <br />Air Quality ac77ca <br />PAGE 13 <br />18 — 659 <br />City of Santa Ana <br />10/3/2023 July 2023 <br />