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Inside the polystyrene box that Mike is carrying is the instrument that actually measures the ozone. Air is sucked into the box, and chemical reactions between ozone and a solution inside it cause a current to be produced (much like a battery) that is proportional to the amount of ozone in the air. The box also has temperature, pressure and relative humidity sensors, as well as a radio transmitter to send all the data back down to the weather station as the balloon goes up.
Photo by Volodya
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