We bought this to help our allergies as we work from home (with a dog), but it happened to arrive the night before the Bay area fires (and we live a couple of miles from the largest one). We woke up to our 1-bedroom apartment literally filled with smoke. In LESS than an HOUR, this purifier completely cleared our apartment, and helped keep our apartment completely cleared even though our entire area, including our apartment hallways, were filled with smoke for days. This was incredible and we appreciate it immensely.