Our battle with air pollution is not just above ground, it is also under; pollution underground transportation can be 20 times higher than roadside air. PM 2.5 and 10 are tiny particles that can enter our lungs to cause damage equivalent to smoking a cigarette for every 20 minutes spent underground. Airtomo is inspired by Nature and how She uses rain to trap and remove particles in the air. To emulate this phenomenon, a water atomiser is used to create vapour clouds. The droplets within these clouds envelop PM to form large, heavy aggregates which fall to the ground. They no longer resuspend, even after water has evaporated, and can be easily removed with a mop or broom. Airtomo wearables offer a vapour cloud to clean the air one breathes or prevent PM from resuspending into the air. Airtomo can also be adopted as an infrastructure system. Scout modules’ infrared sensors detect train or human motion (which increase PM concentration) and inform the main unit to release vapour via Wi-Fi