Don’t get caught off-guard by the massive petrochemical expansion slated for Southwestern Pennsylvania. See the powerful new exhibit, “Petrochemical America: From Cancer Alley to Toxic Valley,” showing now in downtown Pittsburgh through Oct. 7, then in Beaver County from Oct. 16-20. Read more about the exhibit at . Sign up to #resist this development at . This video is a project of the upcoming documentary, “Inversion: The Unfinished Business of Pittsburgh’s Air,” by Mark Dixon. Details at