I highly recommend this filter as a better alternative to the factory part. Although there's nothing wrong with the stock Toyota filter, the addition of activated charcoal and baking soda reduce the odors reaching the cabin from an often-smelly highway. It may not eliminate the most noxious pollutants, but it does help. BTW, I avoid Fram's oil filters, but they seem to manufacture good air filters, both for the ventilation system and for the engine.
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FRAM CF9846A Fresh Breeze Cabin Air FilterProduct Description: Outside air flowing through the vehicle's ventilation system can expose passengers to road dust and pollen. FRAM Fresh Breeze Cabin Air Filters can filter 98% of these contaminants (particles ranging from 5-100 microns). Each FRAM Fresh Breeze Cabin Air Filter contains Arm & Hammer backing soda and carbon which are embedded into the filter to absorb odors and freshen the air.
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This fit perfectly into both our 2004 and 2007 Prii (that's plural for Prius).;o)
The filter fit perfectly and the included instructions were complete and simple. I will be back here to get more when this filter gets dirty.