Smoke or fog (small airborne particles) was excluded by using ultrasonic array. The array consists of approximately 700 piezoelectric transducers. The array was driven so that it formed Bessel beam. The beam had an axial symmetry as well as sidelobes. The airborne particles were excluded from the area between the lobes in the experiments. This method can be used to secure the visibility in smoky fire scene. The method is suitable because it uses no wind which may cause the fire to grow.