at local level / at a local level / at the local level / on a local level

Floora

Member
Français-France
Hello,

I'm french and I have troubles making a difference between :

at local level
at a local level
at the local level
on a local level

Are there differences between these expressions and if so, can you tell me when it is appropriate to use one or another ?
For example, if I'm talking about a policy, is it correct to say "he studies environment policy at a local level" or does another expression suits better?

Thank you for your help!
 
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