Ключевые слова: allergen, allergic, allergies, allergy, allergy pollen, allergy season, asphalt, city, dirt, dirty, environment, flower, fresh, ground, legs, may, natural, nature, outdoor, outdoors, outside, particles, pedestrians, people, pollen, reproduction, season, seasonal, sidewalk, splash, spring, springtime, surface, tree pollen, urban, walkway, water, weather, wet, yellow,