Why pay for fancy air filters when you can simply put up wallpaper that'll do it for you? If your hesitation is that such a wallpaper doesn't exist, well, it does now.
German company Blucher Technologies has created Saratech Permasorb Wallpaper, which uses thousands of tiny spherical absorbers to clean the air around it. Each absorber has thousands of branching passages that mimic the interior of lungs, absorbing and storing pollutants. So all you'll have to do is put the paper up and leave it, and you'll be breathing easier in no time.
There's no word on pricing or availability yet, but hopefully that'll be out soon.