Second, the World Health Organization's (WHO) cancer agency, the International Agency for Research on Cancer (IARC), has recently classified two widely used herbicides as
probably or possible
human carcinogens.
Styrene is recognized as a known animal
carcinogen and found «reasonably anticipated to be a
human carcinogen» by the National Toxicology Program and «
probably carcinogenic to
humans» by the International Agency for Research on Cancer; it is also listed as a
carcinogen under California's Proposition 65 in 2016.