
Coway
Airmega AP-1512HH Mighty
Durable, effective for allergens/odors, but loud on high.

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I have an air purifier that has a hepa filter and a UV C bulb that sterilizes the air passing though it, like in hospitals. No ozone. Seems to work well, bought on Amazon. https://a.co/d/0gog59cP
In addition to the cleaning suggestions and talking to your landlord about the HVAC system needing service, I would get a couple of good HEPA air filters that you can run non-stop. I have 4 of these https://a.co/d/85daMOr and they do a great job of getting dust and debris out of the air before it can settle. It won’t solve the problem, but it will help. The filters are easy to change as well.
I have several of these, and have used them at home and work. I’ve had them for years, and they work well. GermGuardian Air Purifier for Home with HEPA Pure Filter
GermGuardian 743 Sq. ft. Tower Air Purifier with HEPA Pure Filter with activated carbon. It's pretty great!
No I don't hear anything except soft white noise. I love it. I think it was around $70 on Walmart.
With that in mind a germ guardian tower is probably the most affordable good option. Whatever you buy should have UVC light built in to degrade mycotoxins, “plasmawave” or “bipolar ionizer” is also an acceptable alternative just make sure it’s California CARB certified. Stay away from classic ionizer/ozone
I do. I have 3 school aged kids aka plague carriers. We have Germ Guardian UV-C plus HEPA filters in each room. It greatly cuts down on kids reinfecting each other and us parents. They also collect cat hair pretty well. The Germ Guardians were $98 each and 4pack of replacement filters is $30. Saving one doctor visit for the 3 kids covers buying a unit.

Coway
Airmega AP-1512HH Mighty
Durable, effective for allergens/odors, but loud on high.

Levoit
Vital 200S-P
Smart, effective dust/odor; some find replacement filters pricey.

Winix
5500-2
Budget king, durable; poor VOC removal, Plasmawave disliked.

Coway
Airmega Mighty
Durable, great for allergies/dust, responsive auto-fan.

Winix
5510 & 5520
Good value, durable, effective for pets; carbon filter issues.

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IKEA - UPPÅTVIND

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CleanAirKits - Corsi-Rosenthal Box

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Austin Air - Healthmate Plus

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Winix - 5500-2

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Coway - Airmega 400

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Coway - Airmega AP-1512HH Mighty