Earlier quoted context omitted.
Thank you! I'd previously seen reports on the studies about gas stoves being harmful even when off, and wondered about the credibility.
I guess stoves have electric pilots these days, but many installed gas stoves/cooktops have a constantly burning pilot light.
Not for many decades surely. I'm 66 and I haven't used a gas stove that had a pilot light for at least forty years, all have had piezo-electric or mains electric ignition. But then again, I live in Norway now and formerly England not the US.