> unfortunately range hoods don't reduce NO2
You'll have to quote it, since I don't see that in the peer reviewed research. Here's the entirety of mentions of hoods that I found:
> In fact, some kitchens have “ductless” hoods that recirculate fumes through activated charcoal filters, which are generally less effective at cleaning the air.
Where I am, it's illegal to have a gas stove without ducted vents since activated carbon filters won't prevent death from carbon monoxide. As mentioned, I have a ducted fan.
> Vented hoods have a range of effectiveness and function best when overhanging the stove. (12,13)
As mentioned, this is my experience, too. The average hood has abysmal CFM. If you've ever bought a range hood, you'll see know that the higher CFM come at nearly triple the cost, with fancy buttons and grills. There's no way to purchase a cheap AND high CFM vent from a common retailer. I think most people don't go for these high end fans. A duct fan that sucks 5x of a high end fan is probably on the "effective" side of things.
> Because exhaust hoods are separate from the stove and must be operated manually, vented hoods in practice are used only 25–40% of the time.
> Previous modeling-based approaches suggest that residents are exposed to NO2 levels above outdoor acute (1 h) exposure guidelines 62% of the time while using their stove but not using their range hoods, (36) and people use their range hoods only 28–36% of the time. (15)
This is why I suggested it should be automated, otherwise it's forgotten sometimes. Mine turns on with about 1 second of the oven turning on, and stays on for a few minutes after it shuts off. I think this is very important, and I would worry without this.
Perhaps one of the citations in that paper say they're not effective, but it's only suggested that they can be ineffective.
We know range hoods can work since they're used for noxious gases in basically every chemistry lab in the world. So, it's a bit silly to claim they can't work (there are standards to measure effectiveness). I think it's safe to claim that the average range hood is insufficient, but I don't think it's safe to claim that all are insufficient. :)
Regardless, the purpose of my comment was to show that steps can be taken to minimize risk and worry. I think the steps I've taken, according to the peer-reviewed research, do just that.