Bullets fired STRAIGHT (at a 90 degree angle to the ground) into the air usually fall back at
terminal velocity, speeds much lower than those at which they leave the barrel of a firearm. Nevertheless, people can be injured, sometimes fatally, when bullets discharged into the air fall back down. Bullets fired other than exactly vertical are more dangerous, as the bullet maintains its
angular ballistic trajectory, is far less likely to engage in tumbling motion, and so travels at a speed much higher than its terminal velocity would be in a purely vertical fall.
A study by the U.S.
Centers for Disease Control and Prevention (CDC) found that 80% of celebratory gunfire-related injuries are to the head, feet, and shoulders.
[4] In
Puerto Rico, about two people die and about 25 more are injured each year from celebratory gunfire on New Year's Eve, the CDC says.
[5] Between the years 1985 and 1992, doctors at the
King/Drew Medical Center in
Los Angeles, California, treated some 118 people for random falling-bullet injuries. Thirty-eight of them died.
[6]Kuwaitis celebrating in 1991 at the end of the
Gulf War by firing weapons into the air caused 20 deaths from falling bullets.
[6]