The map above displays the hour's average conditions at monitoring stations around the valley. The meteorology information (wind speed, direction and temperature) are average values for the hour. Below, the sulfur dioxide readings at these sites are shown side by side for comparison. Click on the site symbol on the map above or the bar on the chart below for additional current information at that location.

The actual readings from the monitors are displayed as they are calculated by the measuring instruments, and are provisional and subject to change.