That is not correct. I understand where your confusion comes from, but please be careful about spreading wrong information! I will try to make it clear:
R and P rated masks (such as R95 and P95) are used in environments where oil aerosols like pesticides, chemicals, paint, etc. are used. They are special purpose safety devices for workers in certain industries, not intended for general use. They filter “oil based airborne particles”, this is, sprayed particles containing oil. It does not refer to petroleum based pollutants. In particular, it does not refer to pollution generated by petrol fuel vehicles.
For protection against typicial urban air pollution, the approppriate rating is N.