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The original was posted on /r/crboxes by /u/plazman30 on 2025-08-21 01:56:38+00:00.

I have a CleanAirKits luggable 20x25 in my bedroom that I use while I sleep.

Today I went to IKEA and bought a VINDSTYRKA air quality monitor. I plugged it into my bedroom wall and left it there for about an hour. I just went upstairs and checked it and it said my PM 2.5 levels were 20. I turned on my ceiling fan. After running for about 10 minutes to get the air moving in the room It said my levels had gone up to 21. I then turned on the clean air kit filter and let it run for 15 minutes. My numbers are down to 5 now. It dropped to 10 in about five minutes and then it slowly been climbing down. I wonder if it will get below five.

It’s nice to see some personal objective evidence that CR boxes work.