The point is most of the harm comes from the cooking, not the gas. Classic over optimizing. Might as well ban Teflon while you’re at it (the eu did this, as it’s harmful)

I'm not sure whether that's true (nitrogen dioxide can be pretty bad), but I am sure that ventilation is the answer either way. I suspect the main motivation for the ban is to be able to shut down the gas lines in the future because their existence results in methane leaking into the atmosphere. Health concerns might help them sell it ("think of the children" tends to be pretty effective, politically).

Cooking on induction at moderate temperature does not seem to produce significant particulate pollution. Source: I have a stove, and I have a portable PM2.5 meter.

So you can simmer a stock for a couple hours without needing to run the fan (and cook most anything under 300 degrees or so), and with the fan off you don’t lose nice conditioned air from inside.

There is some evidence that the skyrocketing asthma rates are due to natural gas.

They should ban teflon. It leaches estrogen analogues into food, and is an endocrine disrupter. Also, teflon pans last 2-5% as long as cheaper cast iron / stainless steel equivalents (or most more expensive options).