No additional signs of radiation from last week’s North Korean nuclear test have so far been detected by China’s environmental ministry, according to local media.

A report from Xinhua news said none of the 36 monitoring stations near the Chinese-DPRK border had detected any radioactive pollution, with all readings within the normal range.

Beijing’s Ministry of Environmental Protection is currently conducting tests using automated equipment and sending staff to collect samples.

“(Our detectors measure) radiation dosage rate using sodium iodide crystals. This method is currently the most accurate and stable,” deputy head of Jilin Province’s Radiation Environment Monitoring Station said