Those claims have been debunked as being misinterpreted. If you ran a gas stove for 24 hours then yes the amount of NO2 would be illegal outside. But this doesn't consider time-adjusted emissions but rather peak emissions. So you'd have to combine all of that into a single continuous blast, which isn't the case.

As for asthma, current U.S. federal agency involvement on the subject does not identify a connection between cooking with natural gas stoves and the risk of asthma development or direct association with asthma attacks.

Wut, people has been using gas stoves since... forever.

And no asthma has found or correlated in Europe.

With pollution around industry, cars and wastes, yes.

Gas stoves? that sounds tacky as worst.