  Resistive Plate Chambers (RPC) have shown stable operation at the Large
Hadron Collider and satisfactory efficiency for the entire Run 1 (2010-2013)
and Run 2 (2015-2018) with C$_{2}$H$_{2}$F$_{4}$-based gas mixtures and the
addition of SF$_{6}$ and i-C$_{4}$H$_{10}$. Since its global warming potential
(GWP) is high, C$_{2}$H$_{2}$F$_{4}$ is phasing out of production due to recent
European Union regulations and as a result its cost is progressively
increasing. Therefore, finding a new RPC gas mixture with a low GWP has become
extremely important. This contribution describes the simulation of the RPC
efficiency with tetrafluoropropene C$_{3}$H$_{2}$F$_{4}$ (HFO1234ze), a
hydrofluoroolefin with very low GWP. Simulation results are systematically
compared with measurements of RPC efficiency in C$_{3}$H$_{2}$F$_{4}$-based gas
mixtures with the addition of different combinations of Ar, He, CO$_{2}$,
O$_{2}$ and i-C$_{4}$H$_{10}$ in various concentrations. This simulation allows
the study of the interplay between C$_{3}$H$_{2}$F$_{4}$ and the other gas
components in the mixture as well as may allow the identification of the most
promising environment-friendly gas mixtures with C$_{3}$H$_{2}$F$_{4}$ for
RPCs.
