Major GPA in a different field

[scientific]

Hello all,

 

I majored in chemistry with an environmental emphasis. What this means is that I took several environmental emphasis classes in addition to my chemistry courses while not needing a few higher level math courses. I tooka few for my own personal growth but since they were not technically for my major I didn't spend a lot of time on them and did not do as well as I could have.   However, I want to apply for physical chemistry (math-heavy). 

Will my "major GPA" be what should've been for what I'm applying for, or just what I would've used for my major?