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exceedence concentration of 12 µg/m3, or the National 24-hour average exceedence concentration of 35 µg/m3, then the buildings need to have a mechanical supply of outdoor air that has air filtration with sufficient PM2s removal efficiency, such that the indoor concentrations of outdoor PM2.5 particles is less than the California and National PM2.5 annual and 24-hour standards. It is my experience that based on the projected high traffic noise levels, the annual average concentration of PM2.5 will exceed the California and National PM2.5 annual and 24-hour standards and warrant installation of high efficiency air filters (i.e. MERV 13 or higher) in all mechanically supplied outdoor air ventilation systems. Indoor Air Quality Impact Mitigation Measures The following are recommended mitigation measures to minimize the impacts upon indoor quality: - indoor formaldehyde concentrations - outdoor air ventilation - PM2.5 outdoor air concentrations Indoor Fonnaldehvde Concentrations Mitigation. Use only composite wood materials (e.g. hardwood plywood, medium density fiberboard, particleboard) for all interior finish systems that are made with CARB approved no -added formaldehyde (NAF) resins or ultra - low emitting formaldehyde (ULEF) resins (GARB, 2009). Other projects such as the AC by Marriott Hotel — West San Jose Project (Asset Gas SC Inc.) and 2525 North Main Street, Santa Ana (AC 2525 Main LLC, 2019) have entered into settlement agreements stipulating the use of composite wood materials only containing NAF or ULEF resins. Alternatively, conduct the previously described Pre -Construction Building Material/Furnishing Chemical Emissions Assessment, to determine that the combination of formaldehyde emissions from building materials and furnishings do not create indoor formaldehyde concentrations that exceed the CEQA cancer and non -cancer health risks. 11