ELI5: Explain Like I'm 5

PCO2

PCO2 stands for partial pressure of carbon dioxide, which is a measure of how much carbon dioxide is in the air around us. Carbon dioxide is a gas that we all breathe and is produced when we breathe out, but can also be produced by burning fossil fuels. When there is too much carbon dioxide in the air, it can affect our health and the environment. PCO2 measures how much carbon dioxide is in the air, so it is important to know how much carbon dioxide is in the air to protect our health and the environment.