So here is a work in progress mod to get just that! Ever curious about exactly how much pollution you have? This is for you!
How to Use:
-Pollution Reader can be crafted at start, found in the logistics crafting section.
-A GUI display pollution information from the start of the game.
-Enter any name you would like and hit "set", this creates a new category and/or sets your current category to it.
-You can see your current category at the top, any pollution readers you place will be added to this category.
-Pollution Count is taken from an average value of the recorded pollution from every Pollution Reader in a category you have placed.
(Pollution Counts are updated every ~10 seconds)
-Pollution Readers make use of the game.getpollution function, meaning they just read the pollution value in the chunk they reside in.
-If you remove a category, any pollution readers currently registered with it will be moved to the "default" category. If you delete this one, they won't be registered to any category, and you'll have to remove/re-place them to register them again.
I believe it should be working in multiplayer, however I don't have any way to test this myself. If anybody actually does use this and founds out either way, I would appreciate it if you let me know =)
If there are any questions/comments/concerns/ideas, let me know!
Thanks to:
YuokiTani, who provided the cool graphics for the reader!
Degraine, who suggested ideas I was already going to do, but I didn't say that so you get credit

(Besides, I appreciated the feedback. Makes me feel loved

Example