“ We found that an outside-venting range hood reduced peak NO2 concentrations in some cases (Fig. 3B) but that some outside-venting range hoods are ineffective at reducing NO2 concentrations (Fig. 3C). Across a subset of five randomly selected homes, we found that outside-venting hoods reduced hour-averaged kitchen NO2 concentrations by between 10 and 70% (mean reduction in concentration = 35%, n = 5; fig. S15). This result is consistent with prior work assessing the efficacy of installed range hoods, which found that most hoods operating in homes have capture efficiencies well below 70%”
Addresses typical range hoods, not necessarily high CFM quality ones.
“ people with a 75% capture efficiency outside-venting hood who use it every time they cook are exposed to 70% less long-term stove-attributable NO2 than average. The effect on long-term stove-attributable NO2 of opening and closing windows (one window modeled in the kitchen and at least three additional windows, opened or closed all at once; see Materials and Methods) was comparable to the average benefit of using a range hood (Fig. 5).”
Implies higher quality (capture >75%) range hoods help significantly but so does opening a window.