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The refrigerant in that car right now is probably the R134a that’s been in common use for over 20 years. Car manufacturers started switching to R1234yf circa 2016. R134a's effect on the ozone layer is insignificant and it’s non-toxic. But it is very bad for the greenhouse effect. It’s approx. 1300 times worse than CO2 when you calculate the GWP against standard protocols. R1234yf is flammable and highly toxic particularly during combustion when it releases carbonyl fluoride - that's similar to one of the chemical weapons used in the first world war - but it has a very low GWP of about 4.
user87951
As far as I’m aware, it’s highly illegal for anyone to knowingly re-gas aircon when the system is leaking, and the refrigerant gas used is gnarly stuff, both to yourself and the planet.
Deffo get a UV dye check done on the system and repair any leaks before hitting a cowboy re-gasser.