Blue Pure Mini Max

This is the one we have in my son’s room: https://www.blueair.com/products/blue-pure-minimax This is the one we use on each floor in a common area https://www.blueair.com/products/blue-pure-211i-max?variant=49656097767710&utm_source=google&utm_medium=cpc&utm_campaign=%5BShopping%5D%5BStandard%5D%5BUS%5D%5BAll+Products%5D%5BBrand+Queries%5D&utm_content=shopping&gad_source=1&gad_campaignid=23289460546

I second the Blueair purifiers. I have the 211+ non auto in my living room and the smaller versions in my bedrooms. I've had the 211+ running for about ten years and still going strong. The smaller ones I had to replace recently. I got the table top Mini Max through Costco in a 2-pack and I regret that size. I'll get the smaller standing 411 ones again next time.

We have Blue Air - a large one in the main living area, which catches kitchen/cooking particulate, and a mini one in each kid room. Costco has two packs of the minis for $99 right now!

As others said, a good, new high quality 2.5(NOT HEPA) cabin filter WITH carbon with all windows closed and AC on recirculate is getting you 90% of the way there. As far as dedicated air purifiers, aside from some weird DIY solutions(you can probably squeeze a small desk purifier in a car with an inverter, like the Blueair mini) the best for particles is going to be the IQAIR ATEM-which is insanely pricey I wouldn't trust pretty much any other brands(especially those with some stupid ionizer or other similar tech like PCCO/NCCO/plasma/ozone/whateverthefuckishiptoday). You can get big ass bags of carbon that will help with some ac airflow to get rid of toxins, and/or A Philips GoPure purifier. Not the cup holder ones, those don't do anything. Their lineup is hard to determine because they seem to sell different models in different countries at different times and some are discontinued, but what I have now is the GP5212, which seems to be being replaced by the GP5311-which can be gotten on AliExpress for \~$60. First and third party Replacement filters are easy to find on Amazon, EBay, and AliExpress. Their top of the line model-9311 is extremely expensive but specs wise I think gives every model, even the atem-a run for their money. You can still get replacement filters but they're far less widely available in western markets, and cost a pretty penny(\~$45).

I have a BlueAir mini right by him and a larger blue air right outside his room.