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Indoor Environmental Air Quality Assessment <br /> <br />Environmental Solutions Group ● 7 Maple Leaf Drive, Ste 104, Greensboro, NC 27410 ● 336-373-1538 <br />www.Go-ESG.com <br />14 <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 />• Orange 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 />quality-iaq/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 PM10 threshold: 50 mcg/m3 (WHO), 150 mcg/m3 (EPA) <br />o PM2.5 threshold: 25 mcg/m3 (WHO), 35 mcg/m3 (EPA) <br /> <br /> <br /> <br /> <br /> <br />DocuSign Envelope ID: 8114697F-F41C-43F1-AFE2-ADC7016F0955