That sounds analogous to the withdrawal effect which addicts suffer when stopping drugs.
Quickly reducing pollution reduces the short-lived masking effect, which makes things temporarily worse when the pollution stops. It's still worth it and the best option long term.
Hmm, cutting sulfur dioxide emissions for health reasons is bad for global warming because sulfur dioxide clouds have a net cooling effect with reflection.
This is surprisingly often the case. At a short term scale, improvements in the local environment are at odds with improvements towards preventing climate change (hydropower is the poster child for this). Long term though, it's almost always better to prioritize the large scale, as failing to limit climate change will ultimately make any efforts to protect local environments futile.
I'm not American. I don't know much about the history of the body, who runs it or whether leadership changes under different administrations. I also do not know the scientists and whether they are completely state funded or there is industry funding anywhere (on this, or on previous or future research papers). I'm asking questions. I looked at the paper and usually it has a section on conflicts of interest, even to state that none exist. I couldn't see that section on this paper.