| Photo | Credit |
|---|---|
 | Credit: U.S. Chemical Safety and Hazard Investigation Board (CSB) |
 | Credit: Arkema Photo; U.S. Chemical Safety and Hazard Investigation Board (CSB) |
 | Credit: U.S. Chemical Safety and Hazard Investigation Board (CSB) |
 | Credit: West Virginia Department of Health and Human Resources (WVDHHR)/CDC |
 | Credit: Axial/ National Transportation Safety Board (NTSB) |
 | Credit: Transportation Safety Board of Canada License: Creative Commons Attribution- NonCommercial-No Derivs 2.0 |
 | Credit: Transportation Safety Board of Canada License: Creative Commons Attribution-NonCommercial-No Derivs 2.0 |
 | Credit: Axial/National Transportation Safety Board (NTSB) |
 | Credit: CDC/Amanda Mills |
 | Credit: U.S. Chemical Safety and Hazard Investigation Board (CSB) |
 | Credit: U.S. Chemical Safety and Hazard Investigation Board (CSB) |
 | Credit: Shane Torgerson License: Creative Commons Attributions-Share Alike 3.0 Unported |
All other photos and images in this document are in the Public Domain or are used in accordance with their licenses.