Ключевые слова: air, app, breathing, change, climate, corona, cover, covid19, crisis, design, dirty, dust, emission, environment, face, filter, flat, fog, fresh, health, human, icon, illustration, man, mask, medical, mouth, nose, pm10, pm25, pollution, protect, repair, sign, situation, smock, smog, smoke, spread, spreader, symbol, virus, weather, website,