Once upon a time the only air filter on your car was the one attached to the engine air intake, I am convinced that pollen filters are an unnecessary addition, dreamt up by manufacturers to increase the cost of servicing, my previous vehicle required the pollen filter to be changed at the second service, the dealer wanted £80! I declined.
Why does the air within the car need filtering? We breathe the same air as we walk about, or will the requirement to wear a pollen filtering mask soon be a legal requirement.
Vacuum it out, if you can be bothered, or rip it out, you will increase the air velocity from your heater and fascia vents.