How can concentrations of oxides of nitrogen be reported?
Determination of emissions of oxides of nitrogen from stationary sources using an instrumental analyser in accordance with USEPA Method 7E results in direct measurements of NO and total NOx. Following from this, the concentration of NO2 can be calculated as the difference between measured NO and NOx. This data can be reported directly or, if required, converted into an equivalent NO2 concentration. Details of these calculations are given in Appendix I of AMSAAP.
