BOISE,ID (CBS2) — The Treasure Valley—including Boise, Mountain Home, Nyssa, Nampa, Caldwell, and Ontario—is under a Dense Fog Advisory until 1PM this afternoon. Visibility could drop to a quarter mile or less, making driving hazardous. An Air Stagnation Advisory remains in effect until 5 AM Monday. Light winds and a surface level inversion are trapping pollution near the ground, leading to poor air quality. People with respiratory issues, older adults, and children should limit time outside until conditions improve…