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APPENDIX A <br />INDOOR FORMALDEHYDE CONCENTR <br />ANDTHE <br />CARS FORMALDEHYDE ATCM <br />With respeetto form. ildchyde emissions from composite wood products, the CAR13 ATOM <br />regulations of formaldehyde emissions from composite wood products, do not assure <br />healthful indoor air quality. The following is the stated purpose of the CARS ATOM <br />regulation - The purpose of this airborne toxic control measure is to "reduce formaldehyde <br />emissions from composite wood products, and finished goods that contain composite wood <br />products, that are sold, offered for sale, supplied, used, or manufactured for sale in <br />Cal forma". In other words, the CARS ATCM regulations do not "assure healthful indoor <br />air quality", but rather "reduce formaldehyde emissions from composite wood products". <br />Just how much protection do the GARB ATCM regulations provide building occupatts <br />from the formaldehyde emissions generated by composite wood products ? Definitely some, <br />but certainly the regulations do not "assure healthful indoor air quality" when CARB Phase <br />2 products are utilized Asshown in the Chan 2019 study of new California homes, the <br />median indoor formaldehyde concentration was of 22.4 µgtmr (18.2 pph), which <br />corresponds to a cancer risk of 112 per million for occupants with continuous exposure, <br />which is more than I times the Bay Area Air Quality Management District CEQA cancer <br />risk of 10 per million. <br />Another way of looking at how much protection the CARS ATCM regulations provide <br />building occupants from the formaldehyde emissions generated by composite wood <br />products is to calculate the maximum number of square feet of composite wood product that <br />can be in a residence without exceeding the CEQA cancer risk of 10 per million for <br />occupants with continuous occupancy. <br />For this calculation I utilized the floor area (2,272 ftt), the ceiling height (8.5 ft), and the <br />numberof bedrooms (4) as defined in Appendix B (New Single -Family Residence Scenario) <br />of the Standard Methodfarthe Testingandlivaluationof Volatile Orgame Chemical Em issions ferindoor <br />17 of 19 <br />26 <br />75C-54 <br />