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  • Atrazine is a herbicide of the triazine class. Atrazine is used to prevent pre and post-emergence broadleaf weeds in crops such as maize and sugarcane and on turf, such as golf courses and residential lawns. It is one of the most widely used herbicides in US and in Australian agriculture. It was banned in the European Union in 2004 because of persistent groundwater contamination. As of 2001, atrazine was the most commonly detected pesticide contaminating drinking water in the United States. Studies suggest it is an endocrine disruptor, an agent that may alter the natural hormonal system in animals. In 2006 the U.S. Environmental Protection Agency stated that "the risks associated with the pesticide residues pose a reasonable certainty of no harm", and in 2007 the EPA said that atrazine does not adversely affect amphibian sexual development and that no additional testing was warranted. The EPA opened a new review in 2009 that concluded that "the agency’s scientific bases for its regulation of atrazine are robust and ensure prevention of exposure levels that could lead to reproductive effects in humans." The EPA review was criticized, and atrazine's safety remains controversial.

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