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As a result of the anticipated high outdoor noise levels, the Project will likely require a <br />mechanical supply of outdoor air ventilation to allow for a habitable interior environment <br />with closed windows and doors. Such a ventilation system would allow windows and doors <br />to be kept closed at the occupant's discretion to control exterior noise within building <br />interiors. <br />PM2.5 Outdoor Concentrations Impact. An additional impact of the nearby motor vehicle <br />traffic associated with this project, are the outdoor concentrations of PM2.5. According to <br />the Draft Subsequent Environmental Impact Report Metro East Mixed -Use Overlay District <br />Expansion and Elan Development Project (ICF, 2018), the Project is located in the South <br />Coast Air Basin, which is a State and Federal non -attainment area for PM2.5. <br />Additionally, the SCAQMD's MATES V study cites an existing cancer risk of 416 per <br />million at the Project site due to the site's high concentration of ambient air contaminants <br />resulting from the area's high levels of motor vehicle traffic. <br />An air quality analyses should be conducted to determine the concentrations of PM2.5 in the <br />outdoor and indoor air that people inhale each day. This air quality analyses needs to <br />consider the cumulative impacts of the project related emissions, existing and projected <br />future emissions from local PM2.5 sources (e.g. stationary sources, motor vehicles, and <br />airport traffic) upon the outdoor air concentrations at the Project site. If the outdoor <br />concentrations are determined to exceed the California and National annual average PM2.5 <br />exceedence concentration of 12 µg/m3, or the National 24-hour average exceedence <br />concentration of 35 µg/m3, then the buildings need to have a mechanical supply of outdoor <br />air that has air filtration with sufficient removal efficiency, such that the indoor <br />concentrations of outdoor PM2.5 particles is less than the California and National PM2.5 <br />annual and 24-hour standards. <br />It is my experience that based on the projected high traffic noise levels, the annual average <br />concentration of PM2.5 will exceed the California and National PM2.5 annual and 24-hour <br />standards and warrant installation of high efficiency air filters (i.e. MERV 13 or higher) in <br />all mechanically supplied outdoor air ventilation systems. <br />12 of 19 <br />