HEPA (high-efficiency particulate air) filtration can provide noticeable improvements to air quality while also capturing microscopic invaders from surfaces around the house. The filter’s tightly woven mesh-like material uses a three-stage process to capture 99.97% of particles that are 0.3 microns or larger. This means it can trap smoke particles, certain bacteria, and fine allergens like dander, among other debris. Houses with pets are prime applications for this particle-locking system, as it captures particles and odors in one suck. There isn’t a time when HEPA filtration isn’t beneficial, though replacement filters tend to cost more than the average paper options. Most HEPA filters are washable and reusable, though it wouldn’t hurt to have one or two extra filters on hand, so one can be in use while you are washing and air drying the other one.