Americans are stocking up on fireworks ahead of this weekend's Fourth of July festivities. But which ones pose the greatest risk?

Families enjoyed the sights of the town’s annual Independence Day fireworks on June 24.

Aside from the sheer number of fireworks — 4,500 shells, the most of any year Pyrotecnico has designed — this year’s fireworks display will also burst in tandem with live music performed by the Boston...