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Smog tower
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Smog tower

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Smog free tower in Beijing

Smog towers or smog free towers (see below for other names) are structures designed as large-scale air purifiers to reduce air pollution particles (smog). 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. Another approach is to remove urban air pollution by a chimney effect in a tall stack, or updraft tower, which may be either filtered or simply released at altitude as with a solar updraft tower, and which may not require operating energy beyond what may be produced by the updraft.

Roosegaarde's smog free tower

The world's first smog free tower was built by Dutch artist Daan Roosegaarde. It was unveiled in September 2015 in Rotterdam and later similar structures were installed inBeijing and Tianjin, China, Kraków, Poland and Anyang, South Korea. The 7-meter (23 ft) tall tower uses patented positive ionisation technology and is expected to clean 30,000 m3 of air per hour. Below is a gallery of the tower.

Gallery

  • Rotterdam

    Rotterdam

  • Beijing 1

    Beijing 1

  • Beijing 2

    Beijing 2

  • Beijing 3

    Beijing 3

  • Beijing 4

    Beijing 4

  • Beijing 5

    Beijing 5

  • Beijing 6

    Beijing 6

  • Beijing 7

    Beijing 7

Towers utilizing other technologies

China

First generation SALSCS, Xi'an

In 2016, a 100-metre (330 ft) tower has been built in Xi'an, Shaanxi to tackle the city's pollution. It is under testing by researchers at the Institute of Earth Environment of the Chinese Academy of Sciences.

In Xian, central China, an experimental demonstration urban updraft tower is cleaning the air in a Chinese city with little external energy input. A 60-metre urban chimney with surrounding solar collector has significantly reduced urban air pollution. This demonstration project was led by Cao Jun Ji, a chemist at the Chinese Academy of Sciences' Key Laboratory of Aerosol Chemistry and Physics. This work has since been published on, with performance data and modelling.

India

As of 2022, there are at least eight smog towers in India, some of which are smaller in scale:

Projects under development

In Delhi, India Kurin Systems is developing a 12-metre (40 ft) tall smog tower, called the "Kurin City Cleaner". It is different from Daan Roosegaarde's Smog Tower in that it won't depend on the ionization technique to clean the air. The H14 grade HEPA Filter, known for being able to clean up to 99.99% of the particulate matter, will be used instead, together with a pre-filter and activated carbon. It is claimed the tower will filter air for up to 75,000 people within a 3-kilometre (1.9 mi) radius. The Kurin City cleaner would be the strongest air purification tower, cleaning more than 32 million cubic metres of air every day.

Criticisms

Some air pollution experts view smog filtration tower projects with scepticism. For example, Alastair Lewis, Professor of Atmospheric Chemistry at the University of York, Science Director at the National Centre for Atmospheric Science, and chair of the Air Quality Expert Group, has argued that static air cleaners, like the prototypes in Beijing and Delhi, cannot process enough city air, quickly enough, to make a meaningful difference to urban pollution. Instead, Lewis argues that "it is far, far easier to come up with technologies and schemes that stop harmful emissions at source, rather than to try to capture the resulting pollution once it's free and in the air". Sunil Dahiya from India's Centre for Research on Energy and Clean Air has commented that "Installing smog towers has never been, and will never be a solution", noting that the Delhi tower would be powered by (mostly) coal-fired electricity, "so we will only be adding to pollution elsewhere in the country".

According to The Times, environmentalists "decried" the Delhi project on the grounds that "given the city's size and the scale of its pollution, 2.5 million smog towers would be needed to clean its air".

See also

Other names

Other names for the structure include:

  • anti-smog tower
  • smog-filtering tower
  • smog-sucking tower
  • smog-eating tower
  • smog-extracting tower
  • smog removal tower
  • smog control tower
  • smog-alert tower
  • air cleaning tower
  • air-purifying tower
  • air purifier tower
  • air purification tower
  • ambient air purifier
  • pollution control tower
  • SALSCS (Solar-assisted Large Scale Cleaning System)
  • HSALSCS (Hybrid Solar-assisted Large Scale Cleaning System)

Further reading

External links


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