Atrazine safe at 100 PPB now — The World Health Organization (WHO) recently recommended that the allowable concentration of atrazine in water be increased to 100 parts per billion

A recently released World Health Organization (WHO) document has recommended a drinking water standard of 100 parts per billion (ppb), up from the previous WHO standard of two parts per billion. The atrazine drinking water standard enforced by the U.S. Environmental Protection Agency is three parts per billion

What will "The Frog Scientist " Tyrone Hayes Say Now?

3 ppb = 3 drops of atrazine diluted in a standard size swimming pool

100 ppb = 100 drops of atrazine diluted in a standard size swimming pool

http://www.scribd.com/doc/38928168/Dwq-Background-20100701-En-W-H-O-SAYS-ATRAZINE-IS-EVEN-SAFER-THAN-BEFORE

www.who.int/water_sanitation…/dwq_background_20100701_en.pdf

http://www.who.int/water_sanitation_health/dwq/chemicals/atrazine/en/