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A Levoit air purifier for my apartment.

It turns out my respiratory and sleep issues came down to indoor air pollution. Within two hours of receiving the purifier and turning it on full blast, my sinuses cleared, even when laying down for bed. That night I had intense dreams and have been dreaming much more ever since.

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Note you can make a DIY air purifier that's just as effective for much cheaper, though it's ugly. Set up a few of these during wildfire season and it really helps.

https://en.wikipedia.org/wiki/Corsi%E2%80%93Rosenthal_Box

Yep. Impractical and fugly, but okay if you don't have a spouse, children, or care about aesthetics. BlueAir Classic 500/600 series-compatible models are the the way to go. (Was tested by Consumer Reports as the cleanest and quietest combination.) Most are basically just a rugged but minimal holder box for 3 identical filters on 3 sides with a much quieter and durable fan motor, and known good filters. The air a 680i/605 delivers is verifiably <0.5 ppm across PM0.1/2.5/10, eventually cleaning indoor air volume of reasonable size and minimal door opening frequency to an AQI <5. Note: the Classic Pro CP7i new costs almost twice what a Classic 680i/605 used to cost and uses different filters that aren't as good (thinner with less area), and the price is absolutely stupid. Buy a used 500/600 series on eBay for ~$200, clean the heck out of it, and source good filters.

Where do you live?

We had a 8000 kuai (~$1000?) BlueAir when we were in Beijing, it was necessary but really loud (and huge).

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