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DocuSign Envelope ID:6A1278D6-4287-4002-98A9-C69C8C1 D313E <br /> Indoor Environmental Air Quality Assessment <br /> Key for IAQ Data Chart <br /> • TVOC=Total Volatile Organic Compounds, CO2=Carbon Dioxide, CO= Carbon Monoxide, RH= <br /> Relative Humidity,TPM=Total Particle Mass <br /> • Pink readings exceed recommended level of TVOC or RH. <br /> • Purple readings exceed recommended levels of CO or CO2. <br /> • Bold readings indicate that all four size categories where complete fungal and bacterial <br /> spores are located are above the thresholds and airborne contamination is likely. <br /> • readings exceed the EPA's threshold for total particle mass. <br /> o ESG employs a combination of airborne particle counting,which provides a greater <br /> detail about the possible sources of particles, and gravimetric measurement,which <br /> allows for comparison to the established EPA and WHO air quality standards. <br /> • 0.3µm &0.5µm particles are considered ultrafine particles that usually consist of fragments of <br /> organic particles such as bacteria,fungi,viruses, and insects. <br /> • 1.0µm-10.0µm particles are usually comprised of complete fungal or bacterial spores. <br /> o Tobacco smoke can skew the readings obtained by a laser particle counter. <br /> • 1.0µm and 2.5µm particles may include spores from pathogenic Aspergillus & Penicillium. <br /> • 5.0µm particles may include spores from toxigenic Chaetomium &Stachybotrys. <br /> • For more information about indoor particulates, refer to https://www.epa.gov/indoor-air- <br /> guality-iag/indoor-particulate-matter#indoor pm <br /> • The thresholds shown above were derived from the Environmental Protection Agency (EPA) & <br /> World Health Organization (WHO) using airborne total particle mass (TPM). Using a <br /> conversion formula devised by manufacturers of particle counting systems,the number of <br /> airborne particles shown above were converted based on the weight of the particles when <br /> compared to the standards of the EPA and WHO. Refer to the references below: <br /> o PM10threshold: 50 mcg/m3(WHO), 150 mcg/m3(EPA) <br /> o PM2.5threshold: 25 mcg/m3(WHO), 35 mcg/m3(EPA) <br /> Environmental Solutions Group • 7 Maple Leaf Drive,Ste 104, Greensboro, NC 27410 • 336-373-1538 23 <br /> www.Go-ESG.com <br />