Welcome back to Be the Expert! The article we are bringing to you today was first published in the journal “Science of the total environment”, in February this year, titled, “California's early transition to electric vehicles: Observed health and air quality co-benefits”. Authors were; Erika Garcia, Jill Johnston, Rob McConnell, Lawrence Palinkas, and Sandrah P. Eckel. In previous episodes, we have spoken about air quality in the urban environment and some of the strategies to mitigate this, including transitioning to electric vehicles. In this study, the authors looked at whether respiratory health and air quality co-benefits are already noticeable at the relatively low levels of zero-emissions vehicles (battery electric, plug-in hybrid, hydrogen fuel cell vehicle) adoption in California.