The first image below, courtesy NOAA HMS, shows the fire locations across the United States. The red dots correspond to active fires, and the grey areas are plumes. There are large amounts of fires in Canada, specifically in Saskatchewan and Manitoba. Also, in the U.S. there are large fires in the northern Plains region and throughout Oklahoma. The smoke from these fires has covered most of the north eastern portion of the continent. The animation below that shows the AOD values for today, courtesy GASP.
The first image below, courtesy CALIPSO, shows the vertical distribution of aerosols in a swath that streches from the Manitoba/Saskatchewan region down to New Mexico. You can the very thick layer above Canada that is between 500 and 2500 m. Throughout the rest of the image, you can pick out smoke debris at different altitudes stretching across most of the country. These layers are nowhere near as thick or dense as the Canadian Layer.
The animation below shows the EPA AIRNOW ozone hourly values for the United States. The Great Lakes region, Mississippi Valley and California all experienced code oranges today for ozone.