Sulfur Dioxide, In Bulk

Wow, Daesh is using sulfur dioxide as a tool of war. It's not as dangerous as a nerve gas so they pump up the volume to volcanic levels:

New images released by NASA show a dangerous sulfur plume moving across northern Iraq in the wake of the battle to retake Mosul.

As the Iraq military announced its operation to capture Mosul, which has been under ISIS control for over two years, ISIS set fire to the Al-Mishraq sulfur plant and Qayyarah oil field south of the city in an effort to provide cover from coalition airstrikes.

NASA said its ozone monitoring instruments detected a large sulfur dioxide plume dispersing across northern and central Iraq as early as last week. Initially, that sulfur dioxide was in lower parts of the atmosphere, but the plume has now reached higher into the atmosphere due to shifting winds.