Filter captures alot of dust, candle smoke,and other polutants. The filters always come out really dirty after the 90 day use. I have no way to test what other airborne polutants the filters capture, it is all from what Filtrete says the filters do. However, I do notice less dust, and the family seems to stay healthy. I would change the filter every 30 days, but the cost usually prevents me from changing more than every 90 days.