Are there PM2.5 (for filtering out fine particle pollutant) rated cabin filters available for 100 series? It seems the OEM/Denso filters are pretty basic.
The parts I used for retrofitting (cabin filter cover opening didn't exist on my stock 07 LC):
88568-60010 x 2 filters (but Amazon Denso ones probably the same)
88891-60040 cooler cover
88891-60060 slot door
Even back in the early 2000's, wasn't every Corolla/Camry equipped with cabin...