This research examined radioactive contamination levels in edible mushrooms from Southwest China. The study found very low levels of radioactive cesium-137 from nuclear fallout and natural potassium-40 in these mushrooms, indicating they are safe for consumption. Impact on everyday life: – Confirms the safety of wild mushrooms collected in SW China regarding radioactive contamination – Demonstrates the limited impact of global nuclear events on this region’s food supply – Provides baseline data for future monitoring of environmental radioactivity – Supports the continued traditional practice of mushroom foraging in these regions – Helps inform public health guidelines regarding wild mushroom consumption