mg/m 3 NOx = ppm NOx x 2.05. Because of this factor, we have the rather surprising fact that: mg/m 3 NOx ≠ mg/m 3 NO + mg/m 3 NO 2. Oxides of Sulphur (SOx) As with nitrogen, many oxides of sulphur are important in atmospheric chemistry, but only two are commonly present in flue gases. These are sulphur dioxide (SO 2) and sulphur …
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