The solid nanoparticles can be placed in air filtration units or sprayed as a powder.

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

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In fact, she says, the air filtration systems in airplanes take out 99 percent of infectious material, far more efficient than the systems in most offices.

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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.

ENGADGET: blogger-avatar

The 32-story hotel has nearly 1, 200 all new and cutting edge guest rooms, all part of the new Respire by Hyatt hypo-allergenic program, featuring a six-stage process to remove irritants, including state-of-the-art air filtration.

FORBES: Hyatt Regency New Orleans, LA

Other resource-efficient projects like New York's 4 Times Square office building, Atlanta's EarthCraft House and Village Habitat Design's cohousing conservation communities include such innovations as energy-efficient insulation, water and air filtration, or hydronic heating, aiming for healthy, nontoxic construction processes and buildings for humans and the environment.

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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.

WSJ: Airlines Promise the Flying Experience Will Get Better

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

WSJ: Green Goes Mainstream for New Homes��WSJ Mansion