You’ve either misunderstood or deliberately linked an article that doesn’t support your claim about using natural gas cooking.
“Around 2.4 billion people worldwide (around a third of the global population) cook using open fires or inefficient stoves fuelled by kerosene, biomass (wood, animal dung and crop waste) and coal, which generates harmful household air pollution.”
Open fire/stove cooking is the primary cause of COPD in the developing world, in the developed world its smoking. The WHO is not worried about US homes with gas stoves. This article is not about natural gas stoves. The article is about open fire/stove cooking.
I hope others aren’t misled by you. What a shame.