At that ranking, it was deemed to pose a "potential substantial threat to public health or the environment," according to state documents.

Those weapons represented a substantial threat not just to Korea directly, but to the entire world.

In those days that was a substantial threat, but Sepabhodi took the risk.

As a solution they suggest setting our ground forces outside the region and returning only when "more substantial threats" arise.

The advent of e-mail in the late 1990s appeared to offer a substantial threat to the postal service.

The right-wing critics have presented no substantial threat to his power.

The population is suspected to be stable in the absence of evidence for any declines or substantial threats.

But the newest proposal poses a more substantial threat because of the interest it has generated in Washington, they said.

A substantial threat did more to put a hard force on alert than any hundred drills and exercises.

Exceptions would be made only for companies that could show a "substantial threat of insolvency."