Can bike helmets be worn for cycling in areas with poor air quality and actually provide any real protection, or are we just fooling ourselves by strapping on a piece of plastic and thinking were safe from the toxic air. Do helmets have any built-in filtration system or is it just a myth that they can protect us from air pollution. Ive seen some helmets with fancy ventilation systems, but do they really make a difference when youre riding through a cloud of exhaust fumes. And what about the materials used to make these helmets, are they even breathable or do they just trap the pollutants inside. Im not buying the idea that a helmet can keep me safe from air pollution, but Id love to be proven wrong.