CA water is bad.  I recently replaced pipes and saw what the water looked like before the little aerators in the faucets screen out the particulate.  it was positively brown!  On long weekends the water treatment facilities add extra chemicals and I feel nauseous even drinking my filtered water (extra chemicals is my theory, nothing official).    I think the air quality in US is good to great but all the fires in CA can impact that.  Fortunately after Trump threatened not to fund CA if they didn't get fires under control in 2018, we have had the best fire season here in a long time.  Now they switched to torching Australia.  Makes you doubt the leadership in AU that they didn't get it stopped like POTUS.  Pray the globalists loose power worldwide soon.