Unsafe heavy-metal levels have been detected in the Kok, Mekong and Sai rivers in the northernmost provinces of Chiang Mai and Chiang Rai.The pollution is believed to have come from outside ...

Dangerous levels of arsenic and lead have been found in the Sai River and parts of the Kok River in Chiang Rai.

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High levels of arsenic and lead have been detected in the Sai River and parts of the Kok River in Chiang Rai province, raising concerns over water safety, local fish populations, and potential health ...