[Grammar] reductions v.s. reduction

[savemyenglish]

Hi teaches,

I saw a sentence in IELTS model answer:

In conclusion, I think that long-term traffic and pollution reductions would depend on educating the public to use public transport more, and on governments using public money to construct and run efficient systems.

My question is that why "reductions" is used here instead of "reduction". What's exactly the rule of using this kind of abstract nouns in terms of plural?

- A newbie

 

[savemyenglish]

Is it because that the reductions are about two different issues, pleura form is used? Would it be correct if I write "In conclusion, I think that long-term traffic reduction would depend on educating ..."?

 

[Raymott]

Is it because that the reductions are about two different issues, pleura form is used? Would it be correct if I write "In conclusion, I think that long-term traffic reduction would depend on educating ..."?

It could be. It could also be because the total reduction wouldn't be done all at once - there'd be a series of reductions. But either word could be used here.