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Pollution is invisible and knowing how much is around you is not always easy. But a new system called Citisense, which consists of a mobile air quality sensor and smartphone app, could one day give people real-time information about the air around them.

The system, which is still in the research stages and not available commercially, was developed by a group of scientists lead by William Griswold, a computer science professor UC San Diego. It has a mobile sensor that a person wears while walking or biking around a city.