Officials from the Chiang Mai Natural Resources and Environment Office, together with Pollution Control authorities, collect water samples at three locations along the Kok River for lab analysis — all of which were found to be “degraded” with unsafe levels of arsenic and lead. --------------------------------------- Kok River in the North brings arsenic threat to locals  from gold mines across the border Published caption:: Officials from the Chiang Mai Natural Resources and Environment Office, together with Pollution Control  Department authorities, collect water samples at three  locations along the Kok River for lab analysis in late April  — all of which were found to be ‘degraded’ with  unsafe levels of arsenic and lead. PANUMET TANRAKSA