I'm developing a table that shows incoming deliveries. One column shows whether or not the material/item in question is hazardous, and while a reason is given, it's only really necessary for me to display yes or no in this use case.

Naturally, yes has positive connotations. So if I represent it with a checkmark, some people would assume that this hazardous object is safe, thanks to that data. Long story short, a checkmark could mean "yes, it's hazardous" or "it's okay".

One idea I had was to display nothing in that column, or a warning symbol if it's hazardous, but I'm second-guessing myself there. I'm wondering what's the least confusing.

EDIT: Note that users won't be able to interact with the table. It's just on a dashboard.