Special Reports
China's Pollution Headache

Royal Society of Chemistry
September 2007

Chinese scientists have found concentrations of polycyclic aromatic hydrocarbons
(PAHs) in some Chinese cities to be among the highest in the world.

Pollution levels were greatest in areas with colder winters

PAHs are formed from the incomplete burning of fossil fuels and the
International Agency for Research in Cancer has classified them as probable
human carcinogens.

As China is the world's most populous country and largest consumer of coal, and
the number of vehicles on its roads is growing along with its economy, Gan Zhang
and co-workers set out to conduct a large-scale study of PAH levels across the
whole of China, comparing 36 cities (and three rural locations) in all four
seasons of 2005. The team, based mainly at Guangzhou Institute of Geochemistry,
operated by the Chinese Academy of Sciences, found that levels were greatest in
cities on higher ground (in north and north-west China), which had colder
winters and burnt more coal.

Kevin Jones, of Lancaster University, UK, worked on the study and described this
inverse correlation between the average annual PAH concentrations and annual
average temperature as 'significant' and explained that, although several
factors acting in combination influenced air concentrations, 'winter time PAH
concentrations correlated with estimated coal consumption'.

Ian Colbeck, director of the Centre for Environment and Society at the
University of Essex, UK, said Zhang's study was 'another example of the adverse
impact on the environment as a result of China's drive to increase industrial
output'. 'The health implications of the high concentrations of PAHs in the
densely populated Chinese cities are very significant,' he added. Ian Gray
ReferencesX Liu et al, J. Environ. Monit., 2007, DOI: 10.1039/b707977j


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