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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 (CARE) adopted an airborne toxics <br />control measure (ATOM) 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 that are 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., 2018), and found that the median indoor formaldehyde in new homes built <br />after the 2009 with CARB Phase 2 Formaldehyde ATCM materials had lower indoor <br />formaldehyde concentrations, with a median indoor concentrations of 25 µg/m3 as <br />compared to a median of 36 µg/m3 found in the 2007 CNHS. <br />Thus, while new homes built after the 2009 CARB formaldehyde ATCM have a 30% lower <br />median indoor formaldehyde concentration and cancer risk, the median lifetime cancer risk <br />is still 125 per million for homes built with CARB compliant composite wood products, <br />which is more than 12 times the OEHHA 10 in a million cancer risk threshold (OEHHA, <br />2017a). <br />With respect to this project, the buildings at MainPlace Mall in Santa Ana, CA include <br />multi -family residential buildings, a hotel, and commercial and office spaces <br />The residential occupants will potentially have continuous exposure (e.g. 24 hours per day, <br />52 weeks per year). These exposures are anticipated to result in significant cancer risks <br />resulting from exposures to formaldehyde released by the building materials and furnishing <br />commonly found in residential construction <br />3 <br />