Defending Electric Cars - Reply LaveLester B 1976 <p>Martin Smith assumes that our study equated power plant NO<sub>x</sub> emissions to mobile source NO<sub>x</sub> emissions. We used emissions factors drawn from more comprehensive studies of relative emissions from EVs (e.g., power plant NO<sub>x</sub>) and GPVs (tailpipe and associated NO.,. emissions) and found them comparable.</p>