Why does carbon dioxide always diffuse toward the lungs?

Answer 1

In confined space or a room if CO2 increases the oxygen decreases . The CO2 is not what u watch ,watch the oxygen . Normal level is 20.9% but if it drops below 19.5 u will pass out and fall. After u fall to the floor u die because CO2 is very heavy and will suffocate u .

Answer 2

The concentration of CO2 in the body is higher than in the air. Diffusion always goes from higher to lower concentration.