Middle income, and wealthier Americans wouldn't want to live in pollution, so they would

1. Make Laws to stop pollution.

2. Move

3. Support Companies that created less pollution.

America has strict pollution laws as is especially in a state like California where presumably a fair portion of jobs might go to due to its coastal access.

That being said we also have many technologies that can capture, and clean pollution.

It will resolve itself one way, or another.