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Most nitrate contamination in rural parts of California is caused by agriculture.
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This picture taken on December 13, 2011 shows the red polluted Jian River in Luoyang, north China's Henan province. The cause of the river becoming apocalyptic in character was red dye being dumped into the city's storm water pipe network, by two illegal dye workshops,the Luoyang Municipal Environmental Protection Bureau said on December 14, 2011, as authorities said they were working to shut down the workshops, and to disassemble the workshops' machinery.