Correct: Never use the words "polluter" or "spew" because they have negative connotations. Emit, emitter, emissions are more neutral.
I get it! “Emitting” gases and particulates is far better than polluting. Who are you kidding?
Using the language of the people who are attempting to engineer the language to suit their needs is something to be avoided. If we let them define the terms, they will win.
The left takes perfectly good and descriptive words such as “homosexual” (use “gay” instead) and “thug” (you are a racist if you use this word) and tries to engineer by instilling negative connotations with them so people “self-censor”.
In this case, nobody is using the words “polluter” or “spew” except you in your use of the word “emitter”.