This is smoke from a forest fire. The fire was probably started by lightning. When the trees, lichen, and other plants burn, they release carbon dioxide and other gases into the air. Some trees, like the jack pine, depend on fire. The cones of a jack pine are fused shut until the heat of a fire opens them, allowing new trees to grow.
Clue #1 This stuff is not solid.
Clue #2 It is in the air.
Clue #3 You might cough if you breathe it in.