We have a lot of books in the collection that deal with a number of different issues related to pollution. Try using combinations of words like pollution, air, water, quality, environment, etc. For example:
If your first search brings up too many irrelevant items, try using the Refine by Topic suggestions in the box on the left of the search results screen.
We also have a number of reference books on this issue. Take a look through these books for background information or to look up possible topic ideas.