I was advised to implement an event study in the context of air pollution levels after an event had happened. Now my problem is, that I can not really find any introductory literature (or papers), which discuss the event study methodology outside a financial markets context. Everything I find on event studies, talks about stock prices, efficient market hypothesis as a basic assumption, etc. One thing is clear, I can not implement a diff-in-diff, since I do not have any cross-sectional differences in my event. The event happened at the same time in all individuals. I would be really glad on a few tips, books, papers, etc. on how to implement an event study in such a context.