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percent of the residences did not use their windows during the entire preceding week. The comment asserts that because the Project is located near high traffic roadways that generate noise, the Project will require mechanical supply of outdoor air ventilation air to allow for a habitable interior environment with closed windows and doors. Response 23: Refer to Response to Comment 21. Based on this comment a majority (68 percent) of residences opened windows the day of the testing and 85 percent opened their windows during the week of the testing. Thus, the study indicates that a majority of study residences had open windows at least part of the time. In addition, as described by previous responses, building ventilation with air filtration systems that equal to or exceed California Building Code requirements would be installed. Thus, the proposed Project includes a mechanical supply of filtered outdoor air ventilation air for all of the residences. Comment 24: This comment states that traffic associated with the Project would result in increased outdoor concentrations of PM2.5 and that the Project is within a non -attainment area for PM2.5, and that an air quality analysis should be conducted to determine concentrations of PM2.5 and consider cumulative impacts. The comment further states that if outdoor concentrations exceed state and national standards, a mechanical air filtration system for PM2.5 concentrations should be used. Response 24: As described in Draft EIR Section 5.2, Air Quality, the South Coast Air Quality Management District (SCAQMD) maintains monitoring stations that monitor air quality and compliance with associated ambient standards. The Project site is located within the monitoring boundary of the Central Orange County monitoring station (SRA 17), which is 10.2 miles northwest of the Project site. As detailed on Draft EIR page 5.2-9, in 2018 the concentrations of PM2.5 exceeded standards for 3 days. Thus, the level of PM2.5 in the Project area is limited. In addition, as shown in Draft EIR Tables 5.2-7 through 5.2-9, implementation of the Project would not result in exceedances of PM2.5 thresholds. Thus, impacts related to PM2.5 emissions would not occur from the Project. Also, as described in Response 19, the proposed Project includes building ventilation with air filtration systems that equal to or exceed the California Building code. Comment 25: This comment provides recommended mitigation measures to reduce indoor formaldehyde concentrations, which includes: 1) use of only composite wood materials that are CARB approved no - added formaldehyde (NAF) resins or ultralow emitting formaldehyde (ULEF) resins, or complete the previously provided emissions assessment to determine formaldehyde concentrations; 2) provide all habitable rooms with a continuous mechanical supply of outdoor air that meets or exceeds the California 2016 Building Energy Efficiency Standards; and 3) install air filtration with a minimum efficiency of MERV 13 to filter the outdoor air entering the mechanical outdoor air supply system. Response 25: As described in Responses to Comments 19, 21, and 22, the levels of indoor formaldehyde within Project buildings would not exceed the SCAQMD significance threshold of 10 per million and the Project would result in less than significant impacts related to formaldehyde. Therefore, no mitigation is required. However, as required by the U.S. EPA and CARE, the proposed Project would utilize products that have to be manufactured or imported pursuant to TSCA Title VI and California Proposition 65 safe harbor standards. In addition, the Project includes air filtration systems with efficiencies equal to or exceeding the California Building Code requirements. Comment 26: This comment provides a discussion regarding CARB ATCM regulations related to formaldehyde and states that it does not regulate the formaldehyde emissions from composite wood products. The comment also states that if CARB Phase 2 compliant composite wood products are utilized in construction, then emissions assessment to determine formaldehyde concentrations should be completed or 75C-117