This tool allows you to see when and where 186 known petrochemical accidents occurred along the lower Schuylkill River, as superimposed on a current map. The date range is 1866 to 2019. Each dot represents one accident. The color red indicates fatal; orange indicates injurious; and blue indicates non-injurious. Zoom in until you can distinguish individual dots, then click on any one to see associated information.

(Users with data visualization skills may wish to create their own maps or infographics using underlying data. Browse the genre tag "data sheets" for a pair of spreadsheets—one listing injurious accidents and another listing total accidents. A third sheet with data on accident victims is available to professional researchers on request.)