6 .: This article was updated with additional editing.
Nitrogen dioxide is not a serious problem. Levels of the pollutant in China are comparable to those in Japan. Even so levels in Beijing rose 50 percent between 1996 and 2006.
The various methods for the control of water pollution are discussed below:
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"Fine particle pollution is a serious health problem, predicted to get worse in many urban areas and is not effectively managed by state governments," said Dr Ben Ewald, of Doctors for the Environment Australia.