BOISE -- A dense fog advisory was in effect overnight for all of the Treasure Valley, and little change is in the works through Monday. High pressure is maintaining the valley temperature inversions, and some areas outside the inversion may see temperatures reaching the 40's today.

Air quality is getting worse, as the heavy, dense air traps moisture and pollution. The Idaho Department of Environmental Quality announced an Orange Air Quality Alert for both Sunday and Monday. That means the air is unhealthy for certain sensitive groups.

You can learn more about the air quality alerts here. There are mandatory burning bans in effect for both outdoor and indoor residential burning.

The inversion will continue for the rest of the week. A weak storm will clean up the air some but not get rid of the inversion on Wednesday. This means a chance of snow later Wednesday with highs toward the end of the week near 30 degrees, then above 30 by Sunday as another storm brings snow to the valley.

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