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According to howstuffworks.com they use approximately 400,000 cubic feet of helium to keep all of the balloons in the parade afloat.
Initially, the balloons were air-filled and carried by string. Later, a mixture of low-density helium and air was used. quoted from howstuffworks.com

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14y ago
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12y ago

At first the used regular air. Then the switched to helium.

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Q: What gas do they use to fill balloons at the Macy's thanksgiving parade?
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