C02 does build up and ventilation is a good idea. Opening the windows periodically would help. You can also get a C02 monitor if you are concerned.
Personally, I use an air quality monitor that measures PM 2.5 and CO2. It tells me when to open windows, use an air purifier, etc. Mine comes from IQAir Air Visual and is a bit pricey, but accurate. You can get inexpensive ones at other places, just not sure how accurate they are. You should do your own research but that's what I came up with.
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