When the ignition switch is in the ON position, the clean air function turns on automatically.
Also, the clean air function turns off automatically, when the ignition switch turns to the OFF position.
Kia Niro 2017 (DE HEV) Service Manual: Rear Door Outside Handle Components and components location
Component Location
1. Rear door outside handle
...
Kia Niro (DE HEV) Owners Manual: Folding the rear seat
The rear seatbacks can be folded to facilitate carrying long items or to increase
the luggage capacity of the vehicle.
WARNING
The purpose of the fold-down rear seatbacks is to allow you to carry longer
objects that could not be accommodated in the cargo area.
Never allow passengers to sit on ...