Not many people are aware of the dangers of indoor air pollution or even the fact that there even is such a thing. With all the attention that’s been directed to the pollution that affects everyone outdoors, this shouldn't really be surprising. Fortunately, Filter Buy, a family-owned business that specializes in hard-to-find air filters, created an infographic that has all the basics down in a simple format. Here's what we need to understand about air pollution indoors.