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You can definitely see a difference. The air quality is MUCH better than it was 30 years ago. Even 20 years ago.
My problem with CA smog laws is that they're no longer about clean air, it's all a money grab. If it were about clean air, then we wouldn't need CARB EO#s for mods because the smog checks that we've been doing would determine whether or not we were polluters.
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