Air pollution is the top environmental issue for premature death and with impact on productivity and health. Citizens often breathe air that does not meet standards with major sequelae: asthma, chronic obstructive pulmonary disease, and cancer. Other diseases are triggered by pollution: rhinitis, conjunctivitis and dermatologic disorders.

Wellbeing of individuals must be taken into account, and the exposure to risk may be minimized by issuing alerts. Knowing that some city route overpassed the air quality, citizens may act in a proactive way: plan a less polluted route to work, reschedule meetings and take preventive pharmaceutical drugs.

SOUL is based on reliable, inexpensive and georeferenced air quality sensors. The boxes sensors are installed in moving vehicles, mapping dynamical the city. An additional layer of data comes from earth observation satellite images, and other sources of information. Air-quality pollutant-correlating indexes are determined and the users receive in real-time alerts on mobile and web platforms.