A pollution mask has a fan for drawing air from outside the mask chamber into the air chamber and/or drawing air from inside the mask chamber to the outside. The mask has an auto mode for automatic fan speed control and also manually selectable fan rotation speeds. A depth of breathing and a rate of breathing of the user are monitored. Based on monitoring during time periods with manually selected fan speeds, a fan speed strategy is derived for use in the auto mode. This provides a personalized fan speed setting based on a self-learning algorithm.
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