Not doubting if this was bad, but wanted to see if they commented as to the scale of the problem sin e they just state “of some Americans” in headline (and they do!):

Kashtan and colleagues estimate that the average total residential long-term NO2 exposure across the U.S. is 24 percent lower for people with electric stoves, which do not emit NO2.
The average American’s exposure to NO2 exceeds the World Health Organization’s recommended levels. However, approximately 22 million Americans would fall below the WHO-recommended limit if they stopped cooking with gas or cut back their use of it, Kashtan said.