I’ve wondered if we can do better, with my Aranet in Spring, and living close to the forest with the windows open on a breezy day my CO₂ reading went down to 41

I’ve wondered if we can do better, with my Aranet in Spring, and living close to the forest with the windows open on a breezy day my CO₂ reading went down to 410. I’m guessing if someone had their air go through a conservatory first it could go lower. In some climate YouTube videos people slip in the CO₂level of when they were born, an interesting point, mine was 325, but I guess there was more lead in the air then… Is there much of an improvement, impractical as it is, to a far lower CO₂ level.