Have you replaced your cabin filter recently? I did it today.
It is easily forgotten since it is out of sight, but is was certainly filthy after two years. Took about 15 minutes the first time, but will take half that in the future now that I know how. No tools needed.
You can have the dealer do it, but they charge a lot of money for a simple task. It even came with step by step instructions. At the local auto part store it was $8.09 for the Sonata. Others were higher.