Protection is supposed to do in that there are no others because Copenhagen Copenhagen substances harmful to the body should be labeled with the warning page and should include protective cloth robes or nose chemicals.
The defense is in a room where no one else should do it as a substance hazardous to health should be a warning page. And should put a mask or hooded chemical-resistant.
Protection should do in a room without others because of a substance that is harmful to the body should be labeled remind the front of the class. And should wear face mask or chemical protective coat.