Welcome to the Course Guide for Civil and Environmental Engineering 452/652, Air Pollution Control Fundamentals.
The below databases will help you locate scholarly articles, news reports, book chapters, and technical reports about Air Pollution Control and other Environmental Engineering topics. Each database has a different set of items contained within it, and you will want to consider what words the author may have used (e.g. air pollution, or air quality?) Use quotation marks around a specific phrase to search for exactly "state implementation plan" documents.
In some cases, the full text of certain items may take a couple of days to reach you through a request to an agency, or through an interlibrary loan request. Don't delay, and ask a librarian for help if you can't find the full text of something!