Wooden pickets of white, cream, beige, brown, gray and black stand guard over a sun-baked streetscape of bland fences and facades in suburban Port Melbourne.

Read more about what the asexual flag represents here. Nonbinary flag The nonbinary flag has four stripes, yellow, white, purple and black.

But what is it about wildfire smoke that turns the sky yellow instead of, say gray or even black? The answer has to do with atmospheric particles.