I could not resist the challenge, but I had to limit it to LA County to save time. Click the image below to open the application:
It took a little time going through all the municipal codes. Interesting how the cities differer on when fireworks can be sold and when you can discharge them. The data and application are all in the cloud on ArcGIS Online.
Check out the new 2014 app on this post: https://socalgis.org/2014/06/30/fireworks-2014-where-to-buy-and-light/ . It includes cities in Orange and Ventura Counties.