Energy West, the natural gas supplier in Great Falls, Mont., had tried recently to raise awareness of leaks by distributing scratch-and-sniff cards to residents, demonstrating gas's distinctive, rotten-egg smell. In May, workers cast aside several cartons of leftover cards, which were hauled off and disposed of by crushing -- which released the scent and produced a massive blanket of odor over downtown Great Falls, resulting in a flurry of panicked calls to firefighters about gas leaks. [Great Falls Tribune, 5-8-2013]

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