Nizkorodov and colleagues tested various air purifiers in homes, offices and cars. In many cases, ozone levels inside climbed above 90 parts per billion, exceeding California's basic safety threshold. In some cases, ozone soared higher than 350 parts per billion, which if measured outside would trigger a Stage 2 Smog Alert, an event that hasn't occurred in the Southern California coastal air basin since 1988.
On the other hand, it's easier to buy an ionic air machine than to rig up a hose from your car's exhaust pipe to your room...
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Remember those ionic air "purifiers" that were popular a few years ago?
Turns out they fill the air with dangerous levels of ozone:
On the other hand, it's easier to buy an ionic air machine than to rig up a hose from your car's exhaust pipe to your room...