The California Environmental Health Initiative


Science at the intersection of human health and agriculture.


World Health Organization (WHO) International Agency for Research on

Cancer (IARC) announces Roundup and two other pesticides “probably”

cause cancer

In March 2015, WHO/IARC, based on an evaluation by 17 scientists from around the world, concluded that the body of scientific evidence indicates that glyphosate, the active ingredient in the most widely used herbicide in the world, Roundup, and two other pesticides, malathion (aerially sprayed in California today for the beet leafhopper and for many years for the medfly) and diazinon, “probably” cause cancer.

WHO/IARC designated two other pesticides, parathion and tetrachlorvinphos as “possible” carcinogens.

Read the WHO/IARC announcement here.

Read our response to a commentary in the New Yorker magazine on the WHO/IARC announcement here.

Read Center for Environmental Health Research Director Caroline Cox’s post --  “A Once-in-a-Century Pesticide (that Probably Causes Cancer)” -- on the WHO/IARC announcement here.


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