There are over two dozen large fires over the southern half of Idaho and northern half of Nevada, and many smaller ones, with about 200 new lightning starts reported in that region this past week. Many of these are in remote areas, and some are expected to burn until significant precipitation occurs (typically October or November in that area). So, we might be seeing smoke for a while.
As I walked around today, I was thinking that the reduced light through the smoke resembled the partial light during the eclipse in May. Does anyone know how much light is being filtered out due to the haze?
We measure solar radiation at our site on campus. Data is available at http://mesowest.utah.edu/cgi-bin/droman/meso_base.cgi?stn=wbb. With effort, one could attempt to use this to answer your question, although care needs to be taken to account for non-haze effects (e.g., high clouds, etc.).