Wikipedia (https://en.wikipedia.org/wiki/Zone_Rouge) states that "as arsenic can constitute up to 17% of some soil samples" and references "Bausinger, Bonnaire, and Preuß, 2007".
"Android 5.0 Lollipop, which comes on Nexus 6, Nexus 9 and Nexus Player, will also be available on Nexus 4, 5, 7, 10 and Google Play edition devices in the coming weeks."
I don't understand why people keep saying that it won't come on Nexus 4.
I found this study (https://hal-insu.archives-ouvertes.fr/insu-01267232/document) but I am afraid I don't know how to read the results.
I assume that 17% is the absolute maximum proportion of arsenic ever found in a single small sample.