Humans by far, I think.

Reasons:

• We own pets, some of which sit on our laps and fart.
• Some people find it funny and fart on others.
• Some people find it hot and fart on others / get farted on.
• Also, in a sense we love yeast farts so…

Nah, it’s humans. Humans get farted on the most. Walking on foot? You’re walking through farts. Using public transportation? Farts. Going inside any building open to the public? You’ve guessed it, farts. The more crowded a place, the higher the concentration of farts.

Please remember that no matter where you go, someone will fart in your general direction.

I guarantee my dog holds that record.