The Proton is fueled with Nitrogen Tetroxide and a variant of Hydrazine (UDMH). Both are incredible toxic and hazardous to humans, causing death with disturbing

The Proton is fueled with Nitrogen Tetroxide and a variant of Hydrazine (UDMH). Both are incredible toxic and hazardous to humans, causing death with disturbingly small doses. UDMH is also a potent carcinogen. Hopefully these folks were on the road and miles away before those fumes drifted their way.