China built the ‘World’s biggest air purifier’ – and it’s actually working

from Inhabitat

What has been called the world’s largest air purifier by its operators is now up and running in the Chinese city of Xian in Shaanxi province. The 100-meter (328 feet) tall tower has already improved the local air quality, lead scientist Cao Junji told the South China Morning Post, adding that it could prove to be a valuable tool in the country’s fight against urban air pollution. “The tower has no peer in terms of size … the results are quite encouraging,” he said. Greenhouses covering the size of half a soccer field surround the base of the tower, into which polluted air is pulled. The smog is heated in the greenhouse by solar energy, then rises through the tower, passing through several layers of cleaning filters.



Cao stresses that the results are only initial while further details will be released in the spring. A comprehensive scientific assessment of the tower’s effectiveness is also forthcoming. Nonetheless, what is known is promising. While there have been other similar smog-removing towers, many of which were powered by coal-fueled electricity, the Xian tower is unique in its very limited electricity needs. “It barely requires any power input throughout daylight hours. The idea has worked very well in the test run,” said Cao. While locals have marveled at the tower’s size, it is in fact a miniature version of smog-removing towers that Cao and his team hope to install throughout China’s dense, massive cities. The full-size version could reach as high as 500 meters (1,640 feet) while the surrounding greenhouses could cover nearly 30 square kilometers (11.6 square miles).

Via South China Morning Post

Blue sky billboard in smoggy Beijing - China's Toxic Sky

from The Atlantic

Since the beginning of this year, the levels of air pollution in Beijing have been dangerously high, with thick clouds of smog chasing people indoors, disrupting air travel, and affecting the health of millions. The past two weeks have been especially bad -- at one point the pollution level measured 40 times recommended safety levels. Authorities are taking short-term measures to combat the current crisis, shutting down some factories and limiting government auto usage. However, long-term solutions seem distant, as China's use of coal continues to rise, and the government remains slow to acknowledge and address the problems. * Starting with photo #2, a four-part set of these images is interactive, allowing you to click the photo and 'clear the air', viewing a difference over time. (31 Photos here)

World Health Organization: Outdoor air pollution a leading cause of cancer

from The RAW Story (published last week)

The World Health Organization (WHO) on Thursday classified outdoor air pollution as a leading cause of cancer in humans.

“The air we breathe has become polluted with a mixture of cancer-causing substances,” said Kurt Straif of the WHO’s International Agency for Research on Cancer (IARC).

“We now know that outdoor air pollution is not only a major risk to health in general, but also a leading environmental cause of cancer deaths.”

The IARC said a panel of top experts had found “sufficient evidence” that exposure to outdoor air pollution caused lung cancer and raised the risk of bladder cancer.

Although the composition of air pollution and levels of exposure can vary dramatically between locations, the agency said its conclusions applied to all regions of the globe.

Air pollution was already known to increase the risk of respiratory and heart diseases.

The IARC said pollution exposure levels increased significantly in some parts of the world in recent years, notably in rapidly industrialising nations with large populations.

The most recent data, from 2010, showed that 223,000 lung cancer deaths worldwide were the result of air pollution, the agency said.

The data did not enable experts to establish whether particular groups of people were more or less vulnerable to cancer from pollution, but Straif said it was clear that risk rose in line with exposure.

In the past, the IARC had measured the presence of individual chemicals and mixtures of chemicals in the air — including diesel engine exhaust, solvents, metals, and dust.

Diesel exhaust and what is known as “particulate matter” — which includes soot — have been classified as carcinogenic by the IARC.

The latest findings were based on overall air quality, and based on an in-depth study of thousands of medical research projects conducted around the world over decades.

“Our task was to evaluate the air everyone breathes rather than focus on specific air pollutants,” said the IARC’s Dana Loomis.

“The results from the reviewed studies point in the same direction: the risk of developing lung cancer is significantly increased in people exposed to air pollution,” he added.

The predominant sources of outdoor air pollution were transport, power generation, emissions from factories and farms, and residential heating and cooking, the agency said.

“Classifying outdoor air pollution as carcinogenic to humans is an important step,” said the IARC’s director Christopher Wild.

“There are effective ways to reduce air pollution and, given the scale of the exposure affecting people worldwide, this report should send a strong signal to the international community to take action without further delay.”

The IARC said that was set to publish its in-depth conclusions on October 24 on the specialised website The Lancet Oncology.