Frequent Questions

What are the applicable criteria to use in determining whether the human health environmental indicator has been met for the vapor intrusion pathway?

For the purpose of making Current Human Exposure under Control Environmental Indicator (EI) determinations with respect to vapor intrusion, EPA generally recommends the use of 10-5 levels for carcinogens (incremental individual lifetime cancer risk), and a Hazard Quotient (HQ) of 1 for non-cancer risks. (For occupational settings, see question #465).

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