This thread (
https://twitter.com/curious_founder/status/14820133110341427...) is from a different author on the same subject, but basically, the range hood had no effect on NO2 levels. It helped a lot with PM2.5 levels, but not at all with NO2.
From the linked study (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4909253/):
> Ventilation hood installation did not significantly reduce indoor NO2 concentrations in our study, and there was a trend toward higher NO2 concentrations in follow-up visits, although not statistically significant. The reason for the lack of efficacy of ventilation hoods is uncertain.
The research explains that the lack of effectiveness of hoods could be due to many factors (improper installation, lack of use), but at least at first glance it seems that a hood doesn't help with NO2.
As someone who has always preferred a gas stove over electric, this doesn't really align with what I want to believe =). But I also realize there are many times I preheat the oven and cook a frozen lasagna for 50 mins or boil water on the stove without turning on my range hood, so I definitely understand at least one reason that a gas stove with a range hood may not help in terms of reducing NO2 levels in my house. I tend to use the range hood if I'm cooking something really smelly or messy (ie frying), but don't think of it if I'm just baking something in the gas oven for a long period of time.
I know for my part I'm going to be buying an induction cook top for things like boiling water or frying foods where I really don't need gas. I have kids and don't really wanna add to risk of air pollutant exposure.