I personally don’t think studying earth is really what I want out of NASA. I would expect that funding to go towards study of space. For Earth, I would view that as more the job of the EPA or some other agency, and think it’s more appropriate for them to set aside funds for a satellite or whatever they need.
But yes it’s interesting to see where there are unexpected plumes. I suspect a lot of those are in third world countries where regulations and rule of law is worse, and it may be hard to address those effectively (except by subsidizing them). Sure there are some examples in the US, but the ones in the article seem much smaller in magnitude.