'persistent danger' is correct and usable in written English.
You can use it to describe a continuous, long-standing risk or threat. For example, "The city remains in a state of persistent danger due to the high rate of violent crime."
But there is a dark side to the novelty: true and persistent danger.
For reporters, there is a clear and persistent danger in the current state of affairs.
Erosion is a persistent danger right along the route, so keep your distance from the cliff edge.
Some Iraqi-Americans, worried about the persistent danger and concerned that their presence could complicate the transition to a post-Saddam government, said they would wait until a new government was established before considering a visit.
About 4,000 rockets were fired into Israel by the Iranian-backed Lebanese Hezbollah organization during the monthlong war in 2006, and rocket fire from Gaza is a persistent danger.
For example, poor water quality was known to be a persistent danger in fourteenth-century Europe.
Still, in spite of persistent dangers, Israel is striving for peace in the region.
The cases of the journalists have become emblematic of the persistent dangers.
He said that doesn't mean there aren't persistent dangers inside Iraq and militants who "still resort to killing innocents and senseless bombings".
Environmental groups, and an investigation by the ProPublica investigative journalism website, have exposed several persistent dangers: leaks in wells owing to faulty casing or migration through layers or rock; breaches in the above-ground tanks meant to store used drilling chemicals; and a rise in air emissions.
Recognizing Ongoing and Persistent Dangers We know looking at ongoing civil litigation that abuse within interrogation rooms is ongoing and persistent.
