In reply to girlymonkey:
It's a damp earthy smell for me, which triggers my mind to think of the grit (and it's smell), of stolen mornings pottering around soloing or bouldering on the edges of the Peak just after dawn before scooting back to Manchester to real life.
The depressing thing I smell that smell, think those thoughts, then realise I'm driving to work to spend the entire day in an office eon the 5th floor of an generic office block.