Rob Sickles with his son Spencer, 3, on the street between his home and the Dyno Nobel plant in Donora.(Public Source Photo/Marth On April 17, when 30 tons of fertilizer detonated in West, Texas, a shock wave travelling faster than the speed of sound crushed homes. Windows shattered seven miles away. The United States Geological Survey recorded a 2.1 magnitude tremor from the blast. Fifteen people died, 12 of them firefighters and emergency responders, and 200 were injured. The same chemical that blew up West — ammonium nitrate — is manufactured in Donora, Pa., 20 miles south of Pittsburgh.