Obviously, California is not composed exclusively of heavily populated cities. But it does contain a lot of them! So it is not completely insane that the regulation is skewed in favour of this.
Of course, for things that are equally polluting no matter where you do them (like burning fossil fuels), moving production outside of the location but still buying produced materials is simply passing the buck. But it's not totally clear to me that's what's happening here.
> Charged with regulating stationary sources of air pollution emissions, the Air District drafted its first two regulations in the 1950s: Regulation 1, which banned open burning at dumps and wrecking yards, and Regulation 2, which established controls on dust, droplets, and combustion gases from certain industrial sources.
> Much research and discussion went into the shaping of Regulation 2, but there was no doubt about the need for it. During a fact-finding visit to one particular facility, Air District engineers discovered that filters were used over air in-take vents to protect the plant's machinery from its own corrosive emissions! This much-debated regulation was finally adopted in 1960.
https://www.baaqmd.gov/en/about-the-air-district/history-of-...
CO2 might be a long term problem, but it isn't the core health concern of living near combustion facilities - moving those away from residential areas isn't passing the buck, it's just good sense.
This statement doesn't acknowledge why NIMBYism is odious. The reason is that we all need housing, but new housing may devalue current housing. While some may wish to protect their housing values/community feel/etc, others wish and may rightly deserve, access to housing at the same levels of access as earlier generations.
The analogy to manufacturing does not exist—to suggest it does ignores the real negative externalities to people who live next to polluting facilities, especially those where the pollutant was not recognized during use.
The outcome is the same as long as only California does it, but the ethics of it and the outcome if every state acted like that is vastly different