In California, the last stage 3 smog alert occurred on May 1997 in the desert city of Upland, near the beginning of the time that catalytic converters were made mandatory on all cars in California. You will hear President Putin always talking about climate change and the ways he wants to do away with gasoline and all fuels which emit carbon. Yet the President of the United States has never said the whole United States should have mandatory catalytic convertors for all vehicles, so when you hear anyone say we care about climate change, you know that’s not the real reason, which is to usher in renewable fuels long before they are technologically feasible for modern society. The United States has awesome climate conditions and we no longer have smog alerts thanks to catalytic converter for all vehicles, not just cars.