Maybe this will help someone else. If your sensor reports higher readings of something than you’d prefer, normally one would open a window or two and flip on a whole-house fan (roof vent).
However, that means having a whole-house fan (many apartments and condos don’t have one), allowing in bugs or having a very fine window screen to keep tiny bugs out, and potentially allowing in a lot of cold air without really circulating that fresh air throughout the dwelling.
So, here’s a good substitute that I’ve tested and is effective for my dwelling: open one window a tiny bit. It might only be 0.5". Doesn’t need to be much. Then, turn on your bathroom and/or stove exhaust fans. These double as makeshift whole-house fans 
Any one fan is probably enough, especially if it’s far away from the open window.
