I am sitting in the Earthship Visitor’s Center right now, and a man is here to visit. He has a device that measures the CO2 in the air. He says he has never seen a number bellow 400 ppm, unless he is standing at the ocean where the air is very clean. Our Visitor Center measures at 276 ppm, making our air extremely clean he says. There’s no CO2 in our VC!
He has been to other eco friendly homes, and measured the air, saying that none have the clean air this building has. He says if the air is not clean it gives people headaches.