Actually, baking sourdough (which I do), does require the baker to heat their oven to very high temperatures. My oven doesn't allow me to heat it that high, but I do know bakers who heat their oven to 270C or more. It's a valid concern.
Well very little will be released insignificantly small amounts.
Polymer fume fever or
fluoropolymer fever, also informally called
Teflon flu, is an inhalation fever caused by the fumes released when
polytetrafluoroethylene (PTFE, known under the trade name
Teflon) reaches temperatures of 300 °C (572 °F) to 450 °C (842 °F).
[1] When PTFE is heated above 450 °C the
pyrolysis products are different and inhalation may cause
acute lung injury.
[2] Symptoms are
flu-like (chills, headaches and fevers) with chest tightness and mild cough. Onset occurs about 4 to 8 hours after exposure to the
pyrolysis products of PTFE. A
high white blood cell count may be seen and chest x-ray findings are usually minimal.
The polymer fumes are especially harmful to certain birds whose breathing, optimized for rapidity, allows toxins which are excluded by human lungs. Fumes from Teflon in very high heat are fatal to parrots,
[3] as well as some other birds (PTFE toxicosis).
[4]
Polymer fume fever - Wikipedia.
I know single molecules starts to evaporate @ 260C/500F. To be sure do not use it while baking sourdough.