0.5 Hydrocarbons 0.4 - 0.3 CONCENTRATION (ppm) 0.2 NO2 03 NO 0.1 1........... 8 10 12 14 16 18 TIME OF DAY (h) Homework Problem Chemical Engineering: Problem:-Scattering by gaseous molecules (i.e., Rayleigh scattering) is proportional to the density of the air. If the meteorological range due to such scattering is 300km at sea level (1,012mb), what is it at a pressure level of 500mb? Assume that the temperatures at 1,013 and 500mb are 15 and -21C, respectively