At home, ventilation can keep indoor air pollution-free. The problem is that allowing air to enter from the outside also introduces some pollutants. For example, tobacco smoke, car exhaust or wildfire sAt home, ventilation can keep indoor air pollution-free. The problem is that allowing air to enter from the outside also introduces some pollutants. For example, tobacco smoke, car exhaust or wildfire smoke.moke.What is the best way to remove pollutants indoors?