Thank you for your question today, I look forward to assisting you. I bring nearly 20 years of legal experience in various disciplines.
Unfortunately, there isn't any law that will give you a quick resolution to this issue.
Hostile work environment, while also not a quick acting law, doesn't actually apply here. The Supreme Court has stated that that term only refers to harassment based on YOUR race, religion, gender, age, disability or FMLA use. That is not what is happening here.
This is an employer safety issue, but unfortunately, all the law does in terms of employer safety is make the employer financially liable if something were to happen in the workplace.
The only thing that you can do quickly is refuse to go into work and, if you were terminated, file for unemployment based on your employer not providing a safe work environment.
I really wish that I could tell you differently here and I would force one of my employers to address this issue quickly, but obviously your employer is not one of mine. You will have to continue to work through your HR department, because this is not yet an issue that a court can deal with, in terms of employment law.