A wearable air treatment device having a generically annular structure configured to be worn on the head of a user while leaving the face of the user substantially unobstructed, the device comprising: - at least one air suction conduit, evolving between a suction inlet of air to be treated containing suspended pollutant particles, adapted to be arranged near a nose-buccal region of the user, and an outlet of air adapted to be arranged in a rear region of the user's head; - at least one air ejection conduit evolving between a treated air ejection outlet adapted to be arranged near the nose-buccal region of the user and an inlet adapted to be arranged in the rear region of the user's head; - a air treatment unit connected to said air suction and air ejection conduits (1, 2) and in pneumatic communication therewith between said outlet of said air suction conduit and said inlet of said air ejection conduit, said air treatment unit being adapted to be arranged in the rear region of the user's head and comprising: pneumatic flow propulsion means from said air suction conduit to said air ejection conduit; air treatment means configured to receive air to be treated from said outlet of said air suction conduit, and return treated air to said inlet of said air ejection conduit; and energization means of said pneumatic flow propulsion means and said air treatment means; wherein said air treatment means comprise: - a tubular chamber defining an inner side surface of the tubular chamber and evolving along an axis of the tubular chamber between a first end, having a smaller diameter and in pneumatic communication with said outlet of the air suction conduit, and a second end, having a larger diameter, in pneumatic communication with said inlet of said air ejection conduit; - pneumatic flow directing means configured to promote a swirling circulation within said tubular chamber; - at least one water reservoir communicating with said tubular chamber and placed near said first end; - nebulizer means associated with said water reservoir, configured to promote an emission of nebulized water entering said tubular chamber through said first end, whereby: said emission of nebulized water is invested by the air to be treated entering said tubular chamber from said first end, and by effect of said swirling circulation a deposit of water retaining said pollutant particles is formed in adhesion on said inner lateral surface of said tubular chamber and tends to return to said water reservoir. - at least one air suction conduit, evolving between a suction inlet of air to be treated containing suspended pollutant particles, adapted to be arranged near a nose-buccal region of the user, and an outlet of air adapted to be arranged in a rear region of the user's head; - at least one air ejection conduit evolving between a treated air ejection outlet adapted to be arranged near the nose-buccal region of the user and an inlet adapted to be arranged in the rear region of the user's head; - a air treatment unit connected to said air suction and air ejection conduits (1, 2) and in pneumatic communication therewith between said outlet of said air suction conduit and said inlet of said air ejection conduit, said air treatment unit being adapted to be arranged in the rear region of the user's head and comprising: pneumatic flow propulsion means from said air suction conduit to said air ejection conduit; air treatment means configured to receive air to be treated from said outlet of said air suction conduit, and return treated air to said inlet of said air ejection conduit; and energization means of said pneumatic flow propulsion means and said air treatment means; wherein said air treatment means comprise: - a tubular chamber defining an inner side surface of the tubular chamber and evolving along an axis of the tubular chamber between a first end, having a smaller diameter and in pneumatic communication with said outlet of the air suction conduit, and a second end, having a larger diameter, in pneumatic communication with said inlet of said air ejection conduit; - pneumatic flow directing means configured to promote a swirling circulation within said tubular chamber; - at least one water reservoir communicating with said tubular chamber and placed near said first end; - nebulizer means associated with said water reservoir, configured to promote an emission of nebulized water entering said tubular chamber through said first end, - a tubular chamber defining an inner side surface of the tubular chamber and evolving along an axis of the tubular chamber between a first end, having a smaller diameter and in pneumatic communication with said outlet of the air suction conduit, and a second end, having a larger diameter, in pneumatic communication with said inlet of said air ejection conduit; - pneumatic flow directing means configured to promote a swirling circulation within said tubular chamber; - at least one water reservoir communicating with said tubular chamber and placed near said first end; - nebulizer means associated with said water reservoir, configured to promote an emission of nebulized water entering said tubular chamber through said first end, whereby: said emission of nebulized water is invested by the air to be treated entering said tubular chamber from said first end, and by effect of said swirling circulation a deposit of water retaining said pollutant particles is formed in adhesion on said inner lateral surface of said tubular chamber and tends to return to said water reservoir.