I have one too and I can get over 1 000ppm by myself in quite big room while my room also has automatic air recuperation. I can't imagine how it is in any "van

I have one too and I can get over 1 000ppm by myself in quite big room while my room also has automatic air recuperation. I can't imagine how it is in any "van dweller" or "tiny house" place. If you drive motorcycle, you can get 10 000ppm in your helmet, that is close to being out of mind.