The Worldview App which provides the capability to interactively browse over 600 global, full-resolution satellite imagery layers and then download the underlying data shows that extensive fires are plaguing a large portion of Siberia in Russia. Those fires in turn created huge plumes of smoke that traveled air streams into Canada and then to the United States.
Actively burning areas, detected by MODIS’s thermal bands, are outlined in red. NASA image courtesy NASA/Goddard Space Flight Center Earth Science Data and Information System (ESDIS) project. Caption: Lynn Jenner