In practice... people don't use hoods (or maybe they don't work, but almost certainly the former). See for example this study https://www.jaci-inpractice.org/ar

In practice... people don't use hoods (or maybe they don't work, but almost certainly the former). See for example this study https://www.jaci-inpractice.org/article/S2213-2198(26)00537-4/fulltext https://www.jaci-inpractice.org/article/S2213-2198(26)00537-... It was done on people suffering from asthma - with all the reason in the world to improve air quality. Replacing gas stoves with electric stoves a huge effect, on the other hand "installation of a ventilation hood over an existing gas stove in 15 other homes did not significantly change NO2 levels".