You'll be getting a headache from the excess CO2 buildup with the windows closed...

Aaron_Putnam on Dec 19, 2019 | parent | context | favorite | on: Depression and suicide linked to air pollution in ...

You'll be getting a headache from the excess CO2 buildup with the windows closed. If you want to effectively control and monitor indoor pollutants, you also need to buy a CO2+PM2.5 portable monitor. They cost about $80 on Aliexpress.