The Moderate Resolution Imaging Spectroradiometer (MODIS) instrument that flies onboard NASA's Terra satellite captured an image of smoke from these fires Aug. 18, 2015. The multiple red pixels ...

Smoke from Canadian wildfires is threatening at least 21 million in the US as several states experience poor air quality levels. The fumes from the fires, which started last week, are being ...

The company did not immediately respond to USA TODAY's request for a comment ... "This sent a very large, dark plume of smoke into the air that could be seen for miles," the department said.