Ключевые слова: 2021, air, autumn, balkans, blow, blower, city, clean, cleaning, day, device, equipment, europe, exterior, fall, flow, gas, hand, leaf, loud, loudness, machine, noise, noisy, one, orange, outdoors, outside, pavement, petrol, pipe, portable, power, powered, serbia, sidewalk, street, tiled, tiles, tool, tube,