The cheapest way to handle IAQ issues is to prevent them from happening in the first place. To avoid problems, know what causes indoor air pollution so you can avoid mistakes. The EPA has a wide variety of tools and resources that can help you identify common causes of complaints such as old furnishings or flaking paint.
If it’s time to replace fixtures or furniture, be sure to do research before you buy. Look for options that are non-toxic and not prone to mold growth or moisture damage, as well as low- or no-VOC choices.