The phrase "a progressive reduction of" is correct and usable in written English.
It can be used when discussing a gradual decrease in quantity, size, or intensity of something over time.
Example: "The study showed a progressive reduction of carbon emissions over the last decade."
Alternatives: "a gradual decrease in" or "a steady decline of".
They also found that E2 was biotransformed to E1 under both aerobic and anaerobic conditions, which suggests a progressive reduction of the estrogenic potential as time progressed.
This component is found to progressively decrease as a function of catalyst time on stream which indicates a progressive reduction of the nanoparticles under syngas at 503 K.
A progressive reduction of our presence will certainly occur.
Once international agencies had full access to Iran's nuclear program, there could be a progressive reduction of the Security Council's sanctions that are now in effect.
Plus, with the new "reformed" system in place, there'll be a progressive reduction of tax exemptions starting from the 4th year.
Accordingly, a progressive reduction of the molecular mobility was demonstrated by NMR during annealing.
In fact, for medium and long ageing times, a progressive reduction of the joint strength is observed.
Failure was brittle due to the buckling and rupture of the longitudinal bars, which caused a progressive reduction of strength.
This, in turn would lead to a progressive reduction of the step advancement until it stopped, plus an inhibition of nucleation.
Obviously, a progressive reduction of the current efficiency has occurred, probably due to the appearance of side reactions different from the anodization ones [5].
In both areas, the demise of caravans in favour of motorized transport during the last century has surely contributed to a progressive reduction of piebald camel husbandry, the more so considering their widespread use in caravans.
