Let’s talk about the indoor air screening levels for trichloroethene (TCE) and perchloroethene (PCE). This discussion might be useful for managing vapor intrusion issues at a dry-cleaning site and related strip mall or a commercial/industrial site that historically used solvents for cleaning and degreasing. The concepts presented herein are useful for any volatile organic compound (VOC) that can lead to issues with indoor air vapor intrusion. Indoor Air and Soil Gas Screenin