Ключевые слова: air, allergy, background, blue, breathing, clean, closeup, contrast, corona virus, coronavirus, covit19, danger, dramatic, dust, effect, environment, epidemic, equipment, face, filter, flu, health, health care, healthy, illustration, light, mask, medical, n95, n95 mask, object, pm 25, pm25, pollution, prevention, protect, protection, protective, sick, surgical mask, symbol, virus, white, white background,