Updated Let me try to convince you you don't need one. See, I started a social enterprise in Beijing called Smart Air. I started Smart Air because (1) I was living in Beijing, and the air was like this: (2) And air purifier prices were like this: That's more than US$3,000! Now, that's on the upper end, but even mid-level prices struck me as crazy. So I researched how purifiers work, discovered they're actually just a fan and a filter, and started making my own. They weren't pretty, but they worked. Soon I found out other people had the same problem as me, so I started shipping simple low-cost purifiers to anyone who wanted them. Since then, a few people have emailed me asking if they could get the same thing for their car. My first reaction was: good idea!But I'm a nerd, so I wanted to do some tests first. So I'm on the street in Shanghai with my laser particle counter. Here's what the air is like: On the left number, safe is somewhere around 2,500, so this isn't pretty. Next, I got into an Uber.

About 25% of outdoor air. And a few minutes later: Look, ma, no purifier! So why's the air so much cleaner? It turns out car air systems have filters in them already, and apparently they do a pretty good job of filtering out particulate pollution. Just to make sure, though, a Smart Air aficionado ran some tests in his Mazda in Israel. He drives a regular Mazda--no special purifiers. He turns on the AC when he gets in the car, and rolls up the windows. Here's what his tests look like: After seeing this data, I'm pretty convinced we don't need special car purifiers to protect against particulate pollution. All we need to do is roll up the windows, use the fan, and make sure we use the "recycle air" mode rather than the "bring in outside air" mode. Caveats: 1. Particle filters capture solids, but they won't capture gases, like NO2. Thus, it may still be worthwhile to consider using a carbon filter. (Does Carbon Really Work?)2. It's possible that some cars don't have filters in them. If you're not sure, it'd pay to check the car cabin or the manual.

Written Most of the air purifiers that I have seen are either ionizers or ozone generators.  They are completely useless. The ozone generators are so harmful that they are actually illegal in California. You would want an air purifier that has both carbon for the chemicals found in car exhausts and a HEPA filter to capture particles.  We like the Roomaid car air purifier because it has both  carbon and HEPA filter components. It also has a cigarette lighter adapter for power and a seat belt adapter to keep it from becoming airborne in a sudden stop.  It will also plug into regular power so if you happen to be traveling and want an air purifier for use in a hotel or friend's guest room, you just take it out of the car and plug it in to a wall socket.Written I have this ion330 for a year now in my car. its only a hundred dollar plus and i can even put it in my ofc table and in my room. Truly, it filters the bad odor esp in my car, the smoke and cleans the air. its very quiet too , no noisy motor running

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