hazardous area
- dangerExposure to harm
- toxicCapable of causing harm
- warningAlert about danger
- restrictedLimited in scope
- contaminationIntroduction of impurities
radiation · explosive · chemical · biohazard · quarantine · caution · fumes · spill · evacuation · perimeter · barrier · protective · exposure · industrial · minefield · flammable · corrosive · lethal
safety level
hazardous areasafe zone
Protected area from threats
safety zone · safe area · secure area · protected area · safe environment