If the graph for Saturday's forecast looks a little strange, that's because it is. The weather forecasts we consult have differing opinions about tomorrow's conditions, and each of the two weather predictions points to a different direction for the air quality trend. So, the graph above contemplates both possibilities, with the upper range presenting one track and the lower range the other track. If our weather puts us on the upper track, we should see air at Unhealthy rising to Very Unhealthy by noon, then dropping back into Unhealthy. But if the other weather prediction proves to be correct, we should start the day at Unhealthy then begin the drop into Unhealthy for Sensitive Groups. Then if those weather conditions continue, we should spend the afternoon and evening at Unhealthy for Sensitive Groups or in the low range of Unhealthy.
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