I cant find any serious environmental hazards from Boron or its common compounds. Here are some of its uses; and some good links see below.
amorphous boron is used in pyrotechnic flares (distinctive green colour), and rockets (as an igniter)
boric, or boracic, acid, is used as a mild antiseptic
borax, Na2B4O7.10H2O, is a cleansing flux in welding
borax, Na2B4O7.10H2O is a water softener in washing powders
boron compounds are used in production of enamels for covering steel of refrigerators, washing machines, etc.
boron compounds are extensively used in the manufacture of enamels and borosilicate glasses
boron compounds show promise in treating arthritis
10B is used as a control for nuclear reactors, as a shield for nuclear radiation, and in instruments used for detecting neutrons
boron nitride is as hard as diamond. It behaves like an electrical insulator, but conducts heat like a metal. It also has lubricating properties similar to graphite
the hydrides are sometimes used as rocket fuels
boron filaments, a high-strength, lightweight material, are used for advanced aerospace structures, .
lightweight compounds used for aerospace structures
boron filaments used in fibre optics research
Boric Acid is also used in North America for the control of cockroaches, silverfish, ants, fleas, and other insects.