▁gr ades ▁which ▁members ▁are ▁encourag ed ▁to ▁progress ▁their ▁way ▁through ▁during ▁their ▁time ▁with ▁the ▁Society . ▁ ▁The ▁most ▁cov et ed ▁M emb ership ▁grade ▁is ▁'' Ch arter ed ". ▁ ▁Char tered ▁status ▁is ▁intern ation ally ▁recogn ised ▁and ▁sign ifies ▁a ▁high ▁level ▁of ▁professional ▁compet ence ▁and ▁experience . ▁BO HS ▁is ▁the ▁only ▁organisation ▁in ▁the ▁world ▁that ▁offers ▁Char tered ▁M emb ership ▁for ▁Occ up ational ▁H yg ien ists . ▁ ▁As ▁a ▁Char tered ▁Fellow ▁you ' ll ▁be ▁able ▁to ▁use ▁the ▁C M FO H ▁post - nom inals ▁and ▁access ▁all ▁the ▁membership ▁benefits ▁and ▁resources . ▁ ▁References ▁ ▁External ▁links ▁British ▁Occ up ational ▁H yg iene ▁Society ▁Ann als ▁of ▁Occ up ational ▁H yg iene ▁International ▁Occ up ational ▁H yg iene ▁Association ▁World ▁Health ▁Organ ization ▁American ▁Indust rial ▁H yg iene ▁Association ▁National ▁Institute ▁for ▁Occ up ational ▁Saf ety ▁and ▁Health ▁Institute ▁of ▁Occ up ational ▁Medicine ▁Health ▁and ▁Saf ety ▁Labor atory ▁Institution ▁of ▁Occ up ational ▁Saf ety ▁and ▁Health ▁Institute ▁of ▁Er g onom ics ▁and ▁Human ▁Fact ors ▁O H - world . org , ▁ ▁a ▁website ▁for ▁people ▁interested ▁in ▁occup ational ▁h yg iene ▁ ▁Category : Occ up ational ▁safety ▁and ▁health ▁organizations ▁Category : He alth ▁and ▁safety ▁in ▁the ▁United ▁Kingdom ▁Category : He alth ▁char ities ▁in ▁the ▁United ▁Kingdom ▁Category : 1 9 5 3 ▁establish ments