Helium Balloon in Paris Displays Air Pollution Levels

People in Paris won't have to look far to see the city's air pollution levels. A giant tethered helium balloon will display real-time reports of atmospheric pollution using an innovative lighting system, which can be seen from more than 20 km (12.4 miles) away.

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<p><a href="http://www.physorg.com/news134841402.html">Helium Balloon in Paris Displays Air Pollution Levels</a></p> <p>People in Paris won't have to look far to see the city's air pollution levels. A giant tethered helium balloon will display real-time reports of atmospheric pollution using an innovative lighting system, which can be seen from more than 20 km (12.4 miles) away.</p>