This article is trying to focus on falling bullets, but the only death it mentions (the Syrian refugee in Lebanon) was killed by a stray shot fired more or less horizontally from a rooftop, not from a bullet that was fired (approximately) straight up and then fell. And that's of course the real danger of celebratory gunfire - drunken partiers continuing to fire off shots as they're lowering their guns without thinking.
Shots fired upwards generally aren't lethal on the way down because the terminal velocity of a tumbling bullet (which the simulation in this article isn't accounting for) is usually rather low.
Shots fired upwards generally aren't lethal on the way down because the terminal velocity of a tumbling bullet (which the simulation in this article isn't accounting for) is usually rather low.