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One of the most common reasons for a smelly hotel room is an air conditioning unit that has not had a filter change in a while.  Check if the hotel has central forced air or if each room has a filter.  Smaller 2 or 3 story hotels or motels typically have AC in each room.  Larger taller buildings typically have huge central forced air units cleaning and distributing air throughout the building.  These units need cleaning and if they are dirty you can typically smell it in the air with a slight odor.

Take awareness of large buildings and hospitals of the air and you might start to ask questions of the management if forced air units are getting cleaned properly.