"be reduced below" is correct and usable in written English.
It is often used in the context of setting a goal or a standard, as in this example sentence: "Our goal is to reduce our energy costs by 25%, and we will not be satisfied until they are reduced below that amount."
Guidelines suggest that insulin therapy should be initiated when glycated haemoglobin (HbA1c) levels cannot be reduced below 7.5%% (58 mmol/mol) using OADs alone [ 4, 5].
Nominal interest rates on yen assets cannot be reduced below zero.
The difficulty is this: however much many – if not most – people might wish that News Corp's share of UK national newspaper readership could be reduced below the present 37%, we simply have no mechanism to achieve this, apart from changing our newspaper buying habits.
In disease, as well as in certain situations in which physiological adjustments take place, the quantity of hemoglobin may be reduced below normal levels, a condition known as anemia, or may be increased above normal, leading to polycythemia (also called erythrocytosis).
An analysis in November from Congress's nonpartisan Joint Committee on Taxation, which was requested by House Democrats, reported that even if every corporate tax break were scrapped, the 35 percent corporate rate could not be reduced below 28 percent without adding to deficits.
But why should κ be reduced (below one) with increasing overlap?
"When the number of points is reduced below the threshold value, the vehicle no longer shows angry".
"It can result in reserves being reduced below the level needed to protect policyholders".
"Our findings indicate that sleep in industrial societies has not been reduced below a level that is normal for most of our species' evolutionary history".
The pressure of the air in the lungs thus is reduced below that of the outside air, which moves into the lungs quickly to restore equilibrium.
Tax rates have remained low, especially for the highest-paid, but exemptions have proliferated; rates for capital gains and dividends have been reduced below those for earned income.
