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PMID 20301422

After manufacturing millions of MERV 13 filters and fitting countless Goodman systems, we've learned something most homeowners don't realize: the jump from MERV 8 to MERV 13 captures up to 50% more airborne particles, including the microscopic allergens and irritants that trigger symptoms indoors

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These cancer potencies are derived from the respective levels of carcinogen emissions, obtained through analytical chemistry, and their associated inhalation unit risks (i.e., the excess lifetime cancer risk from continuous inhalation exposure to a normalized concentration of the carcinogen)

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Concentration levels and source apportionment of ultrafine particles in road microenvironments