A HEPA filter is an effective way of significantly reducing airborne particles from entering a car, though it’s not a 100% safeguard against coronavirus.
Most new cars have cabin air filters that should be changed periodically, just like a forced-air HVAC system in a house. However, these filters are largely for keeping pollen and dust out of the car. HEPA (high-efficiency particulate air) filters do a better job of capturing even smaller particles than standard off-the-shelf units, like those probably installed in your car... Truck Cabin Air Filter
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