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<br />Environmental Solutions Group ● 7 Maple Leaf Drive., Greensboro, NC 27401 ● 336-373-1538 ● www.Go-ESG.com 20 <br />Report with Protocols for Remediation <br />Environmental Solutions Group <br />Leading people, companies and communities to live, <br />work and prosper in a sustainable environment. <br />can skew the readings obtained by a laser particle counter. 1.0µm and 2.5µm particles may <br />include spores from pathogenic Aspergillus & Penicillium. 5.0µm particles may include spores <br />from toxigenic Chaetomium & Stachybotrys. <br />• The Environmental Protection Agency & World Health Organization have established <br />thresholds for indoor airborne total particle mass (TPM) based on weight. Using a conversion <br />formula devised by manufacturers of particle counting systems, the number of airborne <br />particles can be converted to a number based on the weight of the particles and compared to <br />the standards of the EPA and WHO. <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 /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />DocuSign Envelope ID: A9A4637A-BE59-4285-99BE-D253C29FA836