The federal Chemical Safety and Hazard Investigation Board – which usually refers to itself as the Chemical Safety Board or CSB -- has issued guidance on the hazards of explosive and combustible dust. The report is intended to identify the key barriers to improvement in the control and mitigation of combustible dust hazards. The report was developed by a contractor to CSB, after a fatal 2017 dust explosion at the Didion Milling facility in Cambria, Wisconsin. In October 2018, CSB issued a “Call to Action” to gather comments on the management, control and understanding of combustible dust (which I wrote about HERE). The objective of this project was to make sense of comments submitted in response to the Call to Action. CSB ultimately received 57 responses, which its contractor reviewed and supplemented with additional research.