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Air pollution is an interesting issue: it is complex and (mostly) invisible, yet it is the environmental problem Europeans worry about the most. Up to recently, information about current air pollution was only available through the respective environmental agencies. As they are opening their data, better air quality information platforms are emerging, and they are complementing the official measurement stations with other sources of data.

One of these new air quality platforms is hackAIR, a collective awareness platform for air quality. Citizens across Europe work together to improve air quality data through participatory sensing technology and citizen engagement. hackAIR uses two main user-generated data sources: mobile images and open hardware sensors.