Ключевые слова: adult, air, allergy, bacterium, bicycle, bike, biker, chemistry, city, concept, coronovirus, covid 19, cyclist, danger, dirty, dust, eco, ecology, ecology concept, emission, environment, epidemic, gas mask, global warming, healthcare and medicine, helmet, infection, lifestyle, male, man, mask, mountain bike, n95, outdoor, person, pollute, pollution, protect, protection, protective, respirator, risk, safety, street, town, transport, ukraine, urban, virus, work,