Norway and Switzerland are in the EEA - this means they implement EU directives even though they are not full members. They do so because they get the benefits of trade without the cost of full membership. But it does mean they don't have a say in these policies.
Re engine emissions isn't that down to the engine makers to produce something that will fit. Or we can extend our knitting and use electrics.
Countries such as Mexico have negotiated free trade arrangements with the EU without having to comply with EU rules. The UK can negotiate its own trade agreements with the EU, the USA and the rest of the world.