Most balloons burst with breath by a team in one minute (multiple venue)

According to Official Guinness Records,

The most balloons burst with breath in one minute in multiple venues is 422 balloons by a team of 482 people and was set by dunnhumby employees aka the dunnhumbians, in the dunnhumby offices in Ealing (UK), Cincinnati (US), Paris (France), Delhi (India) on Friday 8th April at 13.00 GMT.
This was part of dunnhumby GWR Live and was their global mass participation record.

For a complete list of 2011 records, please visit 2011 Guinness Records in United Kingdom.

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