Accompanying a newsreader's report of North Korea's launch of a new long-range (claimed up to 10,000km) missile is footage of a launch in which the rocket produces clouds of orange/brown smoke. According to this Wikipedia page, it would seem to be the Hwasong-14, said to be based on a Russian design burning dinitrogen tetroxide and UDMH.
Assuming the preceding is correct, what are the combustion products or by-products producing that nasty-looking and presumably toxic smoke? One might make the simplistic assumption that the fuel components would react to produce carbon dioxide, water, and nitrogen. Even if those are the primary reaction products, there is clearly other stuff being emitted. What is it, and in what sort of quantity? Would it be a chemical hazard for anyone downwind of the launch outside the range of explosion hazard?