NEW RESEARCH QUESTIONS UPDATED MODEL USED IN EPA VAPOR GUIDE

An update to the model that forms the basis of EPA's controversial vapor intrusion guide is facing new criticism from state and EPA scientists, who say the revisions underestimate the amount of chemical vapors in indoor air in existing structures, necessitating indoor air sampling. While sources say the updates to the model still have value for determining the likelihood of vapor intrusion at sites where new structures have not been built, the most accurate way to measure vapor intrusion at...