  Numerical qualification of an eco-friendly alternative gas mixture for
avalanche mode operation of Resistive Plate Chambers is the soul of this work.
To identify the gas mixture, a numerical model developed elsewhere by the
authors has been first established by comparing the simulated figure of merits
(efficiency and streamer probability) with the experimental data for the gas
mixture used in INO-ICAL. Then it has been used to simulate the same properties
of a gas mixture based on argon, carbon di-oxide and nitrogen, identified as
potential replacement by studying its different properties. Efficacy of this
eco-friendly gas mixture has been studied by comparing the simulated result
with the standard gas mixture used in INO-ICAL as well as with experimental
data of other eco-friendly hydrofluorocarbon (HFO1234ze) based potential
replacements. To increase the efficacy of the proposed gas mixture, studies of
the traditional way (addition of a little amount of SF$_6$) and an alternative
approach (exploring the option of high-end electronics) were carried out.
