For larger pores, the two distinct states were not observed (Figure ). For pore-13, PLD decreases slightly from 2.45 to 2.35 Å when temperature is reduced from 423 to 298 K, consistent with higher interaction with CO2 at lower temperatures. The largest pore (pore-16) has a single peak at 3.65 Å, indicating that the confinement is not strong enough to alter PLD (Figure ). These observations confirm that a strong interaction between C=O and CO2 results in the accommodation of CO2 in the pore-10. This takes place via the out-of-plane motion of C=O. A single state is observed for pore-16 because CO2 can be accommodated in the in-plane configuration. The above analysis reveals that C=O is dynamic and makes the pore environment dynamic. Dynamic transport from graphene pores has been experimentally observed from an ensemble of just of few pores, with transport characterized by quantized pore gating. The gas translocation rate, j, is evaluated from the cumulative number of molecules crossing the graphene pore as a function of time (Supplementary Section S2, Figure ). An interesting trend concerning temperature is observed. For smaller pores (pore-10 and pore-13), a two-fold increase in jCO2 occurs from 298 to 323 K. Above 323 K, a steady decrease in translocation rate is observed for jCO2. A key finding is negligible O2 translocation for pore-10 and pore-13 in the 30 ns simulations. These pores are highly selective to CO2. Similar trends are observed at pore-16, where the pores are selective to CO2 at lower temperatures; however, the O2 translocation rate increases at higher temperatures. We reconcile these different trends in translocation rate by examining the free energy for translocation through the pores.