Brief exposure to high levels of PCBs and dioxins may cause skin lesions and affect the liver (the tolerated daily intake for dioxin is about 1 picogram - one trillionth of a gram - per kg body weight).

CNN: THE GREAT DIOXIN SCARE

An average-sized humpback whale eats 2, 000-2, 500 kg of plankton, krill and small, schooling fish but don't worry, no kayakers per day.

CNN: ASIANOW - TIME Asia | Travel Watch | Open the Door to Cool Summer a Escape