Laserfiche WebLink
Monitored Air Quality <br />The air quality at a site is dependent on the regional air quality and local pollutant sources. Regional air <br />quality is determined by the release of pollutants throughout the air basin. Estimates of the existing <br />emissions in the Basin indicate that collectively, mobile sources account for 60 percent of the VOC, 90 <br />percent of the NOx emissions, 95 percent of the CO emissions and 34 percent of directly emitted <br />PM2.5, with another 13 percent of PM2.5 from road dust. <br />The SCAQMD has divided the South Coast Air Basin into 38 air -monitoring areas with a designated <br />ambient air monitoring station representative of each area. The project site is located in the Central <br />Orange County Air Monitoring Area (Area 17), which is located in the central portion of Orange County <br />and covers an area from Anaheim to the north, Cypress to the west, Tustin to the east, and Fountain <br />Valley to the south. Data was taken from the Costa Mesa -Mesa Verde Drive (Costa Mesa Station) and <br />Anaheim -Pampas Lane (Anaheim Station) which are the closest monitoring stations to the project site. <br />Table 3 summarizes years 2015 through 2017 published monitoring data, which is the most recent 3- <br />year period available. The data shows that during the past few years, the project area has exceeded <br />the ozone and Particulate Matter (PM10 and PM2.5) standards. However, it should be noted that due <br />to the air monitoring station distance from the project site, recorded air pollution levels at the air <br />monitoring station reflect with varying degrees of accuracy the local air quality conditions at the project <br />site. <br />Table 3 <br />Air Quality Monitoring Summary' <br />Pollutant <br />Pollutant (Standard)2 <br />Year <br />2015 <br />2016 <br />2017 <br />Ozone: <br />Maximum 1-Hour Concentration (ppm) <br />Days > CAAQS (0.09 ppm) <br />Maximum 8-Hour Concentration (ppm) <br />Days > NAAQS (0.070 ppm) <br />Days > CAAQS 0.070 m <br />0.099 <br />0.090 <br />0.088 <br />1 <br />0 <br />0 <br />0.080 <br />0.069 <br />0.080 <br />2 <br />0 <br />4 <br />2 <br />0 <br />5 <br />Carbon Monoxide: <br />Maximum 8-Hour Concentration (ppm) <br />Days > CAAQS (9 ppm) <br />Days > NAAQS (9 m) <br />0 <br />0 <br />0 <br />0 <br />0 <br />0 <br />Nitrogen Dioxide: <br />Maximum 1-Hour Concentration (ppm) <br />Days > CAAQS 0.18 m <br />0.052 <br />0.060 <br />0.045 <br />0 <br />0 <br />0 <br />Inhalable Particulates <br />(PM10):2 <br />Maximum 24-Hour Concentration (Ng/m3) <br />Days > NAAQS (150 pg/m3) <br />Days > CAAQS (50 pg/m3) <br />Annual Average /m3 <br />59.0 <br />74.0 <br />95.7 <br />0 <br />0 <br />0 <br />2 <br />3 <br />5 <br />25.5 <br />27.5 <br />26.9 <br />Ultra -Fine Particulates <br />(PM2.5): <br />Maximum 24-Hour Concentration (Ng/m3) <br />Days > NAAQS (35 pg/m3) <br />Annual Average /m3 <br />53.8 <br />45.5 <br />56.2 <br />3 <br />1 <br />7 <br />14.7 <br />9.4 <br />Legacy Sunflower Apartments Page 38 <br />Mitigated Negative Declaration — March 14, 2019 <br />