If you’re not totally swayed by the evidence that positive air purifiers cause harmful levels of ozone emissions, why not put your money where your mouth is and stick one by your infant? These Baby Climo units from Takara Tomy filter out bacteria, mold, and odors, all while using just a tiny amount of capability — and looking like tiny little ozone-spewing aliens. Japan-only, but it looks like importers have ‘em for the courageous at $229.