An Atmospheric Chemistry undergraduate program I found requires organic chemistry (http://www.atmos.washington.edu/academics/undergrads/chem.shtml). A course in atmospheric chemistry I found (Rensselaer Polytechnic Institute) indicates its prerequisites are organic chemistry “or equivalent or permission of instructor.”
Hydrocarbons (organic molecules) have a significant role in atmospheric chemistry (http://www.eolss.net/sample-chapters/c06/e6-13-02-07.pdf).