The phrase "are the levels of" is correct and usable in written English.
It can be used when discussing different degrees, stages, or amounts of something, often in a comparative or analytical context.
Example: "In this study, we will examine what the levels of stress are among different age groups."
Alternatives: "what the degrees of" or "the stages of".
Those are the levels of October 1998.
Such are the levels of intrigue, there's hardly a line of dialogue that doesn't have a double or triple meaning.
Of particular interest to the smelters are the levels of antimony and silver.
"Particularly worrying are the levels of small particulate matter (PM 10) in the atmosphere, which is severely deleterious to public health," the report stated.
In fact, such are the levels of all-round student contentment that there is now only a small difference between the highest and lowest ranked universities.
In China, such are the levels of toxicity in the air of most of its major cities that more than 800,000 cases of lung cancer a year are predicted by 2020.
It seems that what determine a plant's ability to survive cold are the levels of sugar and proteins in the cell sap and the permeability of the membrane enclosing the cytoplasm of each cell.
Even now, despite an impressive resurgence in Sheffield's economy in the early part of the 21st century, unemployment, particularly among young people, is significantly higher than the national average, as are the levels of mental health problems and dementia.
Not only are the levels of innovation required to avoid collapse totally unrealistic in a growth-based system; it's the for-profit ethic that created the very problems we now face.
Key factors that affect the successful outcome of such procedures are the levels of contact and pressure across the joint during the arthrodesis compression period.
This government is wilfully putting at risk our patients' safety, the tolerability of our working lives as NHS workers and the very viability of the NHS as a publicly-funded, publicly-provided service Equally novel are the levels of inter-occupational solidarity on display.
