You can close your doors and windows but you still won’t be able to keep pollutants out. Unless you have the Kent Aura air purifier. It comes with HEPA filter technology which eliminates bacteria and dust particles as minute as PM 2.5. The filter’s specially treated carbons are highly absorbent and get rid of foul odor, pet dander, and the smell of cigarette smoke from your home. The best part is that it operates silently and comes with an inbuilt filter change alarm for your convenience.