Sorted by # of facilities Chemical Name Chemical Type # of facilities Pounds in processes Ammonia (anhydrous) Toxic 7,126 9,956,483,361 Chlorine Toxic 2497 832,843,797 Flammable Mixture Flammable 852 39,286,922,024 Propane Flammable 642 11,725,870,245 Sulfur dioxide (anhydrous) Toxic 469 47,307,360 Ammonia (conc 20% or greater) Toxic 459 214,498,002 Butane Flammable 395 8,435,032,565 Isobutane [Propane, 2-methyl] Flammable...