The best replacement for ohsas 18001 is iso 14001.

The best alternatives to ohsas 18001 are rated as following:
★★★★★  iso 14001
★★★  ansi z10
★★  iso 9001
★★  ms 1722
★  as/nzs 4801

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ohsas 18001
iso 14001
ansi z10