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Smog towers or smog free towers (see below for other names) are structures designed as large-scale air purifiers to reduce air pollution particles . This approach to the problem of urban air pollution involves air filtration and removal of suspended mechanical particulates such as soot and requires energy or power.
An air purifier or air cleaner is a device which removes contaminants from the air in a room to improve indoor air quality. These devices are commonly marketed as being beneficial to allergy sufferers and asthmatics , and at reducing or eliminating second-hand tobacco smoke .
HEPA filters are designed to arrest very fine particles effectively, but they do not filter out gasses and odor molecules. Circumstances requiring filtration of volatile organic compounds, chemical vapors, or cigarette, pet or flatulence odors call for the use of an activated carbon (charcoal) or other type of filter instead of or in addition to a HEPA filter. [20]
With the onset of World War II, the depot underwent extensive expansion. Improvements included a 3000-ton floating drydock, two shipways and a 320' x 60' concrete pier with tower crane. The depot, now comparable in size and functions to a medium-size navy shipyard, was officially designated the U.S. Coast Guard Yard.
Dyson Limited, d.b.a Dyson, is a Singaporean–British multinational technology company. [7] Founded in 1991 by James Dyson in Malmesbury, England, the company designs and manufactures household appliances such as vacuum cleaners, air purifiers, hand dryers, bladeless fans, heaters, hair dryers, and lights.
It was designated a National Historic Landmark in 1987, spent the '90s in a shipyard, and ran chartered cruises until 2014. However, the Sequoia fell into disrepair in subsequent years amid a ...
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