This episode of the Crowd and the Cloud, hosted by former NASA Chief Scientist Waleed Abdalati, highlights four community-led data collection projects. These projects focus on issues of air and water pollution and on how citizens have taken data collection into their own hands to promote awareness and enact change. Though all of these stories are excellent and you are welcome to watch the full episode, we have selected just one project for the pre-workshop preparation (Philly Unleaded), which ends at 21:42.

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