anti-pollution when did it start

Here in Australia, we got PCV Valve rules in about 1966/67, Carbon Canisters in about 1975, EGR in 1976, and Catalytic convertors in 1986, as was the introduction of Unleaded petrol.
In the state of Qld, you can put newer engines in an older car, BUT, must run all the pollution gear of that engine.
You can put older engines in a newer car, BUT, it must run on LPG only.....NOT dual fuel.
We don't have Emissions testing here.....yet.