Ключевые слова: air, apocalypse, background, breathe, chemical, civilian, cloudy, concept, contamination, danger, desert, disaster, disease, ecology, environment, environmental, equipment, futuristic, gas, gas mask, global, hazard, human, light, male, man, mask, men, military, outdoor, pandemic, person, poison, pollution, prevention, protection, protective, radiation, respiration, respirator, safety, silhouette, sky, solitude, space, sun, survival, toxic, virus, war,