Finally picked up a CO2 monitor for my desk after having it on my to-do list for ages.

As expected after an hour or two in my office with the doors closed, it gets up to 1400+, and opening the patio door quickly drops it down to about 500 in about a minute or two.

What surprised me a bit this morning was that opening the sliding doors between the office and livingroom, and through the rest of the (reasonably spacious) 2LDK apartment, it stabilized around 930. I expected it would stay lower in the larger space, but not so much.