A green DOT placard indicates a:

A green DOT placard indicates a non-flammable hazard, specifically relating to non-flammable gases. The Department of Transportation (DOT) uses a color-coded system for placarding hazardous materials, and the green color is designated to provide information about the contents that are not flammable or explosive. This helps responders quickly identify the nature of the materials they might be dealing with during transportation incidents.

The other options refer to different types of hazards with their own designated colors and labels. For example, flammable hazards are generally indicated by a red placard, toxic materials may be represented by a white background with a skull and crossbones symbol, and radioactive materials are identified with a yellow and trefoil symbol. By recognizing these specific indicators, emergency responders can approach situations with the proper safety precautions and procedures relevant to the material being handled.