Pollen and Cabin filters serve almost the same exact function.
The pollen and cabin filters clean the air which surrounds the passengers. The difference is the pollen filter only cleans the intake air while the cabin filter cleans the intake and the recirculated air.
A cabin filter needs to be replaced according to the manufacturers service books.
Cabin air filter replacement
Need to change your cabin filter? want to find out how much cabin air filter cost? or how often change cabin air filter?