It used to be that taking an air quality sample required expensive, bulky equipment and teams of people to operate. Now devices that monitor air quality can be bought on Amazon and worn on your wrist.

This is a gamechanger for so-called "fenceline communities," or areas that abut factories and other heavy emitters of air pollutants because it allows area residents to collect their own data. It's also a gamechanger for the companies responsible for those emissions, as this data could be admissible in court.

On today's episode of our environmental podcast, Parts Per Billion, Bloomberg Law reporter Jennifer Hijazi talks about how fenceline communities are collecting air quality data and how this data could change the way the Clean Air Act functions.

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