Fireworks on holidays were also a huge part of Chinese culture, but they've been banned now in cities and the ban seems to be mostly effective.

China even has the same issue as the US, where they aren't banned at the national level so you can still drive two hours and buy them legally. And whatever your stereotypes, China has plenty of scofflaws who aren't going to give something up just because the government tells them to, and its police are, very broadly, less heavy-handed as the US

I suspect banning firework sales in the US would have a significant impact.

China goes up and down on this. In Beijing in 2002, fireworks were pretty muted, there were some but not many. In 2008, completely different, they even burned the facade off of that CCTV cultural center.

Note that Beijing is where the central government is the strongest, although Beijingers aren’t as law abiding as residents of south Chinese cities are. Still, they were selling fireworks (when they were allowed) inside the third ring, you didn’t have to go out to Hebei to get them.

As for what the policy is now, I couldnt tell you, and wouldn’t assume it was one way or the other.

China's a police state where the government has absolute power and isn't limited even slightly by the constitution, with a disarmed population, it's completely incomparable.