When you need to lower the airborne particulates in your home, consider HEPA (high efficiency particulate air) filtration. These filters are available as portable air cleaners, whole-house purification systems and even vacuum cleaner bags. A filter carrying this designation traps 99.7 percent of all particles up to .3 microns, which is nearly everything you find in indoor air, with the exception of some gases, including tobacco smoke or radon.