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INDOOR ENVIRONMENTAL ENGINEERING <br />1448 Pine Street, Suite 103 San Francisco, California 94109 <br />Telephone: (415) 567-7700 <br />E-mail: offermann@IEE-SF.com <br />http://www.iee-sf.com <br /> <br /> <br /> <br />Date: November 21, 2018 <br /> <br />To: Richard T. Drury <br />Lozeau | Drury LLP <br />410 12th Street, Suite 250 <br />Oakland, California 94607 <br /> <br />From: Francis J. Offermann PE CIH <br /> <br />Subject: Indoor Air Quality: Magnolia at the Park - Santa Ana <br />IEE File Reference: P-4198 <br /> <br />Pages: 10 <br /> <br /> <br />Indoor Air Quality Impacts <br /> <br />Indoor air quality (IAQ) directly impacts the comfort and health of building occupants, and <br />the achievement of acceptable IAQ in newly constructed and renovated buildings is a well- <br />recognized design objective. For example, IAQ is addressed by major high-performance <br />building rating systems and building codes (California Building Standards Commission, <br />2014; USGBC, 2014). Indoor air quality in homes is particularly important because <br />occupants, on average, spend approximately ninety percent of their time indoors with the <br />majority of this time spent at home (EPA, 2011). Some segments of the population that are <br />most susceptible to the effects of poor IAQ, such as the very young and the elderly, occupy <br />their homes almost continuously. Additionally, an increasing number of adults are working <br />from home at least some of the time during the workweek. Indoor air quality also is a <br />serious concern for workers in hotels, offices and other business establishments. <br />The concentrations of many air pollutants often are elevated in homes and other buildings <br />relative to outdoor air because many of the materials and products used indoors contain <br />and release a variety of pollutants to air (Hodgson et al., 2002; Offermann and Hodgson,