The Environment Agency said the questions concerned the facility's air filtration system.

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To cope with air pollution in China, artist Matt Hope produced a "Breathing Bike, " that consists of a fighter pilot's breathing mask attached to a pedal-powered air filtration system.

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It will also feature an improved air-filtration system and an LED lighting scheme that can be programmed to help fight the effects of jet lag, as well as larger overhead storage bins.

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To ensure good air quality inside, it has both an air-exchange system and a geothermal system that have filtration.

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