Fireworks can make bad air quality even worse. For some cities, the answer is drones

They zoom instead of boom. They flash instead of flare. They assemble into shapes so sophisticated — a swimming whale, a spinning globe, a marching robot — that traditional pyrotechnics can seem a little lackluster in comparison. Maybe most importantly, the drones being employed by more and more cities for Fourth of July celebrations don’t leave behind a blanket of smoke at a time when America’s air quality is already at its worst in decades. […]

Click here to view original web page at www.npr.org