Toyota (and other makes) inexpensive in-cabin air filter source.

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Originally Posted by TheSilkySmooth

What do you do to breath when you step out of the car? Gas mask? I guess they keep the mice out of the evaporator.

it keeps dust out of the car. don't need to wipe pollen and dust off the dash
nearly as often as without a filter. it cuts DPM and diesel soot.

they turn black in months. they sure do clean -something- out of the air.