The two NOAA Aerosol Watch images show a distinct differnce in AOD levels on the West Coast. The left image shows a high level of AODs in small parts of the West Coast especially California and Oregon where as the right image shows a severe level of AODs covering all of the West Coast.
The NOAA Hazard Mapping System Fire and Smoke Product images above support this claim as on September 22nd there is a moderate level of smoke concentration originating in certain regions of California. However, on the 10th of September there is a heavy level of smoke concentration that is traveling Westward across the Pacific Ocean. In addition, this heavy level of smoke concentration covers the whole west coast.
Finally, the AirNow Map image above shows that currently there is only one region of the West Cost that has a Very Unhealthy AQI (Purple, 201-300) whereas on September 8th there are multiple parts that reaches a Hazardous AQI (Maroon, 301-500).