The phrase "an extreme level of" is correct and usable in written English.
It can be used to describe a very high degree or intensity of something.
Example: "The project faced an extreme level of scrutiny from the board of directors."
Alternatives: "a high degree of" or "an intense amount of".
It's extreme professionalism, an extreme level of playing.
"Rock and roll got into an extreme level of simplicity," he explained.
"There is an extreme level of loyalty you don't see in other businesses".
One line of inquiry aims to understand the Higgs boson by measuring the particle to an extreme level of precision.
Minimalism is a deeply rational kind of modern art, and rationalism, like spiritualism, carried to an extreme level of control can become a form of terror.
There's an extreme level of mutual comfort: Dallas has been inMLS for 21 seasons, and Pareja has been involved in 16 of them.
They talk the mean-girl talk ("As long as my hair looks good, my confidence is at an extreme level," says Camille, 18, of Trophy Club, Tex)., but they break just like little girls.
Over the past year, however, hunger has reached an "extreme level" in many parts of the world, with famine declared in South Sudan in February, and Yemen, north-east Nigeria and Somalia considered on the brink.
Conceivably, a different result would occur at a less extreme level of hyperoxia.
She argued that sometimes, because the Greens' policies are radical, they have received "a very extreme level of hostility".
"But you need a really extreme level of concentration and that's what I'm working on". After one goalless game following his record run - albeit in a match where he provided two assists - the first Gabonese to play in Germany's top flight responded with what he calls his year-long highlight.
