However, I doubt the Chinese are trying to sabotage the fireworks industry; probably not a good delivery system for a nuclear warhead. LOL. The biggest risk is more than likely the idiots who mishandle them.

Fireworks contain (1) fuel - usually black powder or charcoal; (2) oxidizing agent - needed to provide the oxygen for the firework to burn: (3) reducing agent - usually sulphur or charcoal to burn the oxygen and produce hot gasses: (4) regulators - to regulate the speed of the action; (5) coloring agent - Strontium (red), Copper (blue), Barium (green), Sodium (yellow/orange), Calcium (orange), Gold (iron); (6) binders - usually a starch to hold the whole composition together.

So, Happy 4th of July!

Fireworks have been arround for centuries and are not messed with. Enjoy them while you can because many cities are not having displays because of money. If you look at what they contain most of the material is fertilizer of one type or another.