BreatheSmart 35i

Purifiers under 200 wont do much for odors unfortunately. Or not for very long. You need thicker filters with black carbon pellets -these absorb odors. The normal white filters in most purifiers just capture particles. Does nothing for odors. Under 200 dollar units will fair chance have a thin carbon layer which is good for smoke, and only modestly helps a little with odors, as well they might even have a small amount of carbon pellets..however these wont be as good as bigger/better units, and wont last as long. As for odors you probably need to spend closer to 300 id say. So an Alen 35i would be a good choice, although I believe it is 290. (maybe 270 ? I saw it on sale recently for 250 perhaps.) So Alen's are a great brand as you get a lifetime warranty...if you remain in the filter replacement program. So with their best filters for odors + VOC's...thats 90 bucks every 9 or 12 months, of your choice. They are also quiet + energy efficient. Better units for odors are AustinAir and those are like 750 bucks. The cheapest way to help with odors would be to get a ventilator, such as what weed growers have..which is only around 60-120 bucks, with a custom carbon filter attached. Although you have to mess with the ventilation so its not something I have done. (I just got an Alen 45i + a bunch of other purifiers.) So I'm not even sure if 1 alen unit will completley eliminate your odor issue, you might need more than 1 unit perhaps, but it would go a long way. Heres an example ventilator with caron filter: [https://www.amazon.com/dp/B0CBPDTSKS/ref=sspa\_dk\_detail\_2?pd\_rd\_i=B0CBPDTSKS&pd\_rd\_w=uI1E4&content-id=amzn1.sym.f2f1cf8f-cab4-44dc-82ba-0ca811fb90cc&pf\_rd\_p=f2f1cf8f-cab4-44dc-82ba-0ca811fb90cc&pf\_rd\_r=CHVHY04GHGQ35FE4AG8E&pd\_rd\_wg=S0mcy&pd\_rd\_r=54d044df-6b88-4bb3-b969-83f1b1c8700b&sp\_csd=d2lkZ2V0TmFtZT1zcF9kZXRhaWxfdGhlbWF0aWM&th=1](https://www.amazon.com/dp/B0CBPDTSKS/ref=sspa_dk_detail_2?pd_rd_i=B0CBPDTSKS&pd_rd_w=uI1E4&content-id=amzn1.sym.f2f1cf8f-cab4-44dc-82ba-0ca811fb90cc&pf_rd_p=f2f1cf8f-cab4-44dc-82ba-0ca811fb90cc&pf_rd_r=CHVHY04GHGQ35FE4AG8E&pd_rd_wg=S0mcy&pd_rd_r=54d044df-6b88-4bb3-b969-83f1b1c8700b&sp_csd=d2lkZ2V0TmFtZT1zcF9kZXRhaWxfdGhlbWF0aWM&th=1) If you put the litter box as far away from your bed as possible, and then put a purifier between you and the litter box...that will probably help a lot. Although again, you will get more bang for your buck with a ventilator...if you have a very strong odor issue. Under 200 dollar units are great overall, and will clean your air, get rid of the pet dander, pet hair, taxoplasmosis probably etc. But it just won't make a huge impact on strong odors. (A little, but you would likely need 2 or 3 or 4 of such units to combine the amount of carbon...that you would get in 1 better unit, or a carbon filter ventilator.) You can also buy carbon strips, and carbon pellets for around 12 bucks I believe, and place them around your room, for another DIY method. So something like that with a ventilator, or an Alen 35i will definitely help. (Given you also want to clean the air and do not want to get parasites/toxoplasmosis from your cat, you probably want to get a purifier either way, whether you get odor stuff or not.) Edit: for other good brands/units look at Winix, Coway, and Levoit. So a Winix 5520 has I believe some carbon in the filter, as does Leviot Vital S 200, a Levoit Core 300 etc. So perhaps 2 of those affordable units might do the trick, but you may have to replace the filters semi-frequently to continue to control the odor. So a Winix 5520 is 160 ? + a Levoit Core 300 is 90, so you can get both for 250. put on either side of litter box...and that would probably have a good impact.

I believe they have multiple units called "Flex" which means its the same as the other unit,  but without the smart features/ionizer, so a little cheaper, but same size and otherwise same.  So you can get more coverage area with a Flex, if you dont need or want the smart features.  So on amazon the 35i is around 290-300, so for about 50 bucks more you can get the 45i Flex, which has bigger + better  coverage. (What I have and love.).   But I have a largish apartment, and have a lot of odor and mold from an old carpet I inherited here.  For maybe smallish apartment or normal ish 35i probably fine, so depends on how big your space is.  But they are excellent units, quiet, energy efficient, and lifetime warranty (when sticking with the filter replacement plan 9 or 12 months.).  The 35i is 11 pounds, 45i 15. Ideal coverage 700 sq feet vs 950.   The Flex I believe, is just either unit without the smart features/certain features.  So if you just want cheapest price/most coverage per dollar...go with a Flex.  If you want smart features then get the regular but you pay a little more for the smart features, vs a Flex of one size up.  So for me, id recommend pay a little more and get a 45i Flex for more impact, unless you really need/want the smart features.  (And again depends how big your space, what coverage you have etc.)   Get the more expensive filter with carbon layers for odor control, they go from 90-120 or so.)  and last about 1 year. 

An affordable and long lasting one is Alen 45i, around 300-400 bucks and they have a lifetime warranty. (if you stay signd up with the filter replacement plan, with one every 9 or 12 months, your choice.) It has black carbon filter material, and is good overall, would be very good for a 300 sq foot area. Levoits are great for lonevity as I've had mine running continuously for 5 years...still going...most other affordable brands will break or have problems but the Levoits last forever. However, they dont have a huge amoount of carbon, only a litlte in some of the filters I think. If you can afford a lot consider the pricey units others are suggesting. I cant afford that and use a combination of levoits + an Alen + RIA Breezeguard (my best unit overall with carbon fiber layer + UVC + humidifier all built in, however it doesn't have a lifetime warranty but so far its been great after a few years. Around 400 I think. The RIA Breezeguard is bigger + pushes more air and has more options (also app/phone control.) But you prob wont need that so much in a small studio apartment. So if you want longevity/lifetime warranty and good effectiveness for the area you have...the Alen 45i is a good choice imo. If you had a bedroom then add a levoit in there for more coverage etc. The only downside to my Alen 45i is that it doesn't super forecefully move air on high, it just kind of goes pretty steady....but it lasts forever and for your small space, if placed in a decent spot where air is flowing...then would still be very good for now + long term. Add in more units once you move to a bigger space. You can also just buy some black carbon filters (for any brand really) and place a few around if you want to capture more odors, esp smoke. So Ria BreatheSmart great all-around unit with excellent features, good carbon, but unsure about longevity Alen 45i seems to meet all your needs with longevity, carbon, size etc. Levoits awesome for longevity as well (not lifetime warranty but they last a long time) but just so-so on carbon I think. (Don't know thier newer/more pricey models as my 2 100 dollars ones have lasted years....) Ofc I like all 3 brands and use all 3 in my bigger space (+ more in bedroom etc.)

Here In US we don't have Phillips so much, so I've never had one, although they do some popular/common in posting in here and are probably OK.  I have multiple Levoits though and love them.  As for being quiet in sleep mode you might want to look at th Levoit unit sprout, that is more for a nightstand, and very quiet.  However it also has a weaker motor + smaller filter so it doesn't move as much air as a Core 300.  So I am not sure what setting sleep mode is (1 I guess ?) but then ofc your purifier isn't moving as much air so you get less CADR in sleep mode.  So one thing. You can do is get 2 units and run them both on low/sleep mode, for more CADR.   I really don't know what "quiet" means to you as that is subjective, but my levoits are defintely pretty quiet on low.  But again...you get less CADR like that so run them on high when you are awake at least imo.   Levoits are great and the Core 300 is one of the best units available for it's size + price point.   Levoits also do have some carbon in their filters, and some pellets, however it's not as much as bigger/better units.  So they can help, but no purifiers under 200 bucks or so will dramatically change smoke or odors a lot.  It can help a little though.  Good units for smoke + odors are Austin Air which is 750 bucks, Rabbit Air which are also very quiet (but lowish CADR don't move much air, same with the Austin Air, as slower air movement is better for the carbon + pellets to absorb the odors.) as well an Alen is a good brand that is a mix of decent CADR but with good filters for smoke + odors (if you get their best ones) and very quiet and energy efficient.  And they come with a lifetime warranty if you remain in the filter replacement program. However their smallest, the 25i is probably around 200-250 bucks ?    As you pay a little more for the benefit of a lifetime warranty.   So it really depends how important quiet is and the odor stuff.   Levoit makes great all-around units that can cover the basics for most people and do it well.  I've had two Core 300's running near continuously...for 5+6 years now...so incredible durability + value for the you lay.  (And performance.). But Phillips seems like an OK brand too (as far a I know) so if you can get a good deal on that, probably fine too.  Ofc as a Levoit fan I would get the Levoit.  Or if you can save up a little more, get an Alen 25i as that is probably quieter than both of those units, and better for smoke/odors, if you get their best filter.  

I don't have the Vitals but they are great units too.  So the Vital S will be slightly weaker than the 300, but very close in power, and a little quieter too.  And with the smart functions.   So In this video they compared a bunch of purifiers, and the Vital 200 (bigger than the 100) was still quieter than the Core 300.  So the Vital 100 is apparently 23-52 decibels.  And 143 CFM on high.  The Core 300 goes to 64 decibels or so, and 155 CFM.   So you might be happy trade a little CFM for a bit more quiet.  It seems like a logical choice for you I'd say.  Although if you can afford a Vital 200 that will be better for bigger rooms if you will be moving it around.  But really - you will want at least 2 units anyway as it's best to have 1 in each room, or at least in main area you spend time in + bedroom.  So a Vital 200s great for a living room, and the 100s great for a bedroom.   So get whichever you can afford now...and then get the other later.  Slowly add units...until you have excellent for coverage.  (Which might be 2-3 units depending on your space, if carpets, your allergies etc.). You will likely notice a big difference, even with 1 unit.   So you will prob want to buy more...once you see the difference.  (As I did.)   But a a Vital 100S a great start, esp for a bedroom.  In this video at around 20:10 or 20:54 he shows the chart with the results. (He didn't happen to test the vital 100 here, but the 300+200s + their smaller one and the Levoits performed really well, and best at thier size.)  https://www.youtube.com/watch?v=sQGfO4hNb60