How clean can you even get Otto engines if you put technology in the right way?

Hello together, in view of the planned, once again intensified EU exhaust limits for cars I am just wondering, if there burners, especially Otto engines, also diesel, can technically still come along because of me? Let’s say, it can really cost something, like today often a hybrid drive extra, what should you do exactly and how clean you get gasoline engines at all? According to the motto “Chemiefabrik im Trunk”. What would they have to do and with which components. One could read somewhere that one could make for about 3000 euro per vehicle extra price series cars (petrol cars) really clean. At least like e-cars in the overall inspection. Or are gasolineers anyway all switched to gas or some eco-tanking, which is then again considered politically “good”? I regret it very much that the manufacturers seem to swing on electric. The charging and the range I find completely inadequate and for me as a lantern parker basically not usable. So I really don’t need a car. Even today’s small engines, so Polo or Dacia with 3-Zyl would have to have to have a look like of 50, but a bit less CO.