Fastest half marathon wearing a gas mask

According to Official Guinness Records,

The fastest half marathon wearing a gas mask is 1 hr 27 min 23 sec by Andy McMahon (UK) at the Kinloss to Lossiemouth Half Marathon in Lossiemouth, Moray, UK on 19 February 2012.

For a complete list of 2012 records, please visit 2012 Guinness Records in United Kingdom.

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