Why is there a foul odor inside the subway cars?

Question

Why is there a foul odor inside the subway cars?

Answer 1

Because millions of people ride them daily - and we are bacteria factories. and yes, some people p**s themselves. some don't shower, others are on drugs and like to sweat (bacteria) and well, it just smells when you are pressed together.

Answer 2

Was that you?

Answer 3

People go to the bathroom in there! I avoid them at all cost!

Answer 4

because homeless people sleep in there at night, and they also use the bathroom there

Answer 5

I'd say its cos of the drunk men who travel at night, they obviously pee in there, hence the stench