The major subdisciplines of environmental health are: environmental science; environmental and occupational medicine, toxicology and epidemiology. Environmental health is the branch of public health concerned with all aspects of the natural and built environment affecting human health. Vanadium Page One. Vanadium pentoxide (V2O 5) is used as a catalyst, dye and color-fixer. Environmental health is focused on the natural and built environments for the benefit of human health. Overview of Vanadium; Vanadium's Name in Other Languages Vanadium Menu. Additional Notes: Many sources credit Nils Sefström with discovering vanadium in 1831, however, this is more of a rediscovery as it had already been discovered in A.M. del Rio in 1801.