Yeah, this. 1000ppm is very noticeable, true 2000 is unbearable. Living in a center of a city next to a 10-line highway opening a window drops a properly cali

Yeah, this. 1000ppm is very noticeable, true 2000 is unbearable. Living in a center of a city next to a 10-line highway opening a window drops a properly calibrated sensor into 400s inside a few minutes.