clipped from: earth911.com 
Fireworks are hardly an environmentally friendly activity, but they’re an unwavering Fourth of July tradition. If you’re setting off your own fireworks this year, be sure to use fireworks rich in nitrogen. They often cost a bit more but put out less smoke into the environment.
Another option is to gather your group and go see your local fireworks display. It’s a great way to see a much bigger fireworks show and negates you from harming the environment with your own personal display.