I’m sure everyone knows this but just in case someone doesnt:

Burning anything where air is the oxidizer creates nitrogen oxides. Because they have a triple valent bond they are very stable so they are around for a long time. If you combust in higher pressures you create more of them. They contribite to acid rain and low level ozone pollution. They are a problem.

All that said I don’t think gas stoves are a huge health concern. I would think OSHA would ban natural gas forklifts from operating indoors if that were the case.