The easiest way to test the concentration of soot is to use a soot concentration detector. Soot: the incomplete combustion of oil substances deposited fine and loose black soot; can be used to make ink, ink and so on. We usually frying dishes emitted soot is cooking oil and food at high temperatures, resulting in a large number of thermal oxidative decomposition products. Cooking, grease is heated, when the temperature reaches the fuming point of cooking oil 170 ℃, there is an initial decomposition of blue smoke, as the temperature continues to rise, the decomposition rate accelerated when the temperature reaches 250 ℃, a large number of oil smoke, accompanied by pungent odor, soot particles in the 0.01 micron -0.3 micron.