It turns out that Shakespeare's Theater causes pollution (or at least I have the pollution possibility icons in the city screen... I haven't seen orange splats on tiles) in the game I'm playing, even if the city is below size 13. I have a city at size 7 with a hospital in the same game with no pollution at all. There do exist some rule changes about how huts and flood plains work.
Also, if you wonder why I have a sub 13 size city with Shakespeare's Theater, the reason lies in that I would need a harbor to increase the size of the city to have enough food to support 14 citizens, and the harbor would take turn time away from building culture.
Edit: A few turns after I wrote the above, the city did get pollution on a tile, even though still at size 12.
Also, if you wonder why I have a sub 13 size city with Shakespeare's Theater, the reason lies in that I would need a harbor to increase the size of the city to have enough food to support 14 citizens, and the harbor would take turn time away from building culture.
Edit: A few turns after I wrote the above, the city did get pollution on a tile, even though still at size 12.
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