Fill the gaps
percentage
many
cleaning
regularly
steam


We already know 1) ______ things that can pollute the air. But sometimes there are some things that we couldn’t think of. Dust, 2) ______ products and even steam can act like air pollutants. To reduce the 3) ________ of air pollution at home we must apply filters. They remove even the smallest particles of dust, smoke, 4) ________ and other pollutants and create a clean air. One thing that we shouldn’t forget about is that we should clean the filter itself 5) ______. In the other case we can get even dirtier air than it was before the filtration started.