Is it normal for some to have more dirt come out of their pores?

Is it normal for various amounts of dirt that come from our pores varies in each individual or do we all slough off grime at the same rate? I'm not an excessively sweaty person and I do wash my hands regularly but they seem to hold dirt more than some people. I don't want to become another Howard Hughes with excessively washing hands, but man. Oh, and please don't sugggest hand sanitizers I use those along with soap and water.

Another thing that doesn't help is that I live in dirty NYC.