Toyota Prius V 2012 Quick Reference Manual page 315

Micro dust and pollen filter button
PRIUS v_U (OM47674U)
3-1. Using the air conditioning system and defogger
Operates micro dust and pollen
filter on/off.
Outside air mode switches to
recirculated air mode. Pollen is
removed from the air and the air
flows to the upper part of the
body.
Usually the system will turn off
automatically after approximately
3 minutes.
I n f o r ma t i o n P r o v i d e d b y :
3
285