Moderate PM2.5 AQI levels were experienced in the Pacific Northwest and states east of the Ohio River Valley, as shown in EPA's Airnow animation. NOAA's Hazard Mapping System Fire and Smoke Product indicated that smoke and fires were detected in today's satellite observations in the Pacific Northwest and the Southeastern US (Google Earth NOAA HMS fire and smoke overlay). NOAA reported as well the presence of an elongated area of aerosol along much of the California coastline. Is believed to be comprised mostly of thin remnant smoke from fires that are burning in California, Oregon, Washington, and British Columbia.
In Arizona, blowing dust yesterday led to a serious accident on Interstate 10. The PM10 levels were elevated with most monitors reaching levels of 200-400 ug/m3 during the noon to 4 p.m. period, according to Arizona's Department of Environmental Quality.
Size distributions from today's sun-photometer retrievals (courtesy of AERONET) reveal the presence of coarse particulate in today's observations over Yuma, AZ.