Thankfully I am outside Vancouver city limits but when they banned them inside the city limits I heard they were paying overtime to catch people and give out those $500 tickets. I idea if they will keep that up or not but they have a 1 day allowance here for the day of the 4th and people are doing the once every couple hours thing - which doesn't really bother us any. But the ones like @Mikej mentioned after 10pm are super annoying.
I give a lot of leeway on "The 4th of July". It has ALWAYS been the best holiday of the year. Even when I was a real kid. Some of the parties we've had/been to. WOOF! Up and down the street was pall of smoke, if it was a calm night. But come 11:00 pm, time to wind down. And done at midnight. Kind of a bummer actually. Seems all that's left is the guys with the HUGE boomers. And doing them here and there until 2:00 am. I miss seeing the faces of the young kids, huddled up under blankets watching the adults do the "adult" fireworks after they've done their smaller stuff earlier in the night.
