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particleboard. These materials are commonly used in building construction for flooring, <br />cabinetry, baseboards, window shades, interior doors, and window and door trims. <br />In January 2009, the California Air Resources Board (CARB) adopted an airborne toxics <br />control measure (ATCM) to reduce formaldehyde emissions from composite wood <br />products, including hardwood plywood, particleboard, medium density fiberboard, and also <br />furniture and other finished products made with these wood products (California Air <br />Resources Board 2009). While this formaldehyde ATCM has resulted in reduced emissions <br />from composite wood products sold in California, they do not preclude that homes built <br />with composite wood products meeting the CARB ATCM will have indoor formaldehyde <br />concentrations below cancer and non -cancer exposure guidelines. <br />A follow up study to the California New Home Study (CNHS) was conducted in 2016-2018 <br />(Chan et. al., 2019), and found that the median indoor formaldehyde in new homes built <br />after 2009 with CARB Phase 2 Formaldehyde ATCM materials had lower indoor <br />formaldehyde concentrations, with amedian indoor concentrations of 22.4 µg/m3 (18.2 ppb) <br />as compared to a median of 36 µg/m3 found in the 2007 CNHS. <br />Thus, while new homes built afterthe 2009 CARB formaldehyde ATCM have a38% lower <br />median indoor formaldehyde concentration and cancer risk, the median lifetime cancer risk <br />is still 112 per million for homes built with CARB compliant composite wood products. <br />This median lifetime cancer risk is more than 11 times the OEHHA 10 in a million cancer <br />risk threshold (OEHHA, 2017a). <br />With respect to 0 and Mortimer Project in Santa Ana, CA the buildings consist of multi- <br />family residential buildings and commercial buildings. <br />The employees of the commercial spaces are expected to experience significant indoor <br />exposures (e.g., 40 hours per week, 50 weeks per year). These exposures for employees are <br />anticipated to result in significant cancer risks resulting from exposures to formaldehyde <br />released by the building materials and furnishing commonly found in offices, warehouses, <br />residences and hotels. <br />7d6138 <br />