And you need a chemistry/ meteorology lesson. Humidity mixed with assorted dust etc does not turn the air in the last 100 feet or so !!!!ty brown , nor does it dye bare feet, any horizontal surface , mucous membranes, Children's lungs black when you walk on it / are subjected to it / breathe it.
The conditions are exactly the same as the Ruhr Valley etc back in the 70's when pollution was so bad that good old BFBS used to make TV broadcasts telling people ( especially children) not to go out in it. Two things different here; we can't blame it on freezing fog , and our plutocratic, money obsessed, venal excuse for a government hasn't got the balls ( nor the inclination ) to tell us the truth.