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Monitoring of essential and heavy metals in green tea from different geographical origins https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4762913/

Same for many edible seeds. For example pumpkin seed and sunflower seed have high hyperaccumulation capacity.

Yep. If you research green tea throughly this comes up as a major concern leading one to learn that it is very difficult to obtain any green tea that is free of toxins. Supposedly one of the best was regular Lipton tea bags.

Another concern should be the Fukushima disaster, close to japans biggest teacultivation areas.