Poisonous and harmful trace gases in the atmosphere, are critical Nitrogen oxides (NO x = NO + NO 2) and sulfur dioxide (SO 2), The results of our sensitivity studies are important to make optimum use of Measurements are a very well-suited tool to quantify point source emissions. (4) Our study suggests that emission rates < 30 g s −1 for NO x and < 50 g s −1 for SO 2 are not recommended for mobile DOASīased on the model simulations, our study indicates that mobile DOAS To minimize the ∕ ratio correction error, we recommend minimum distances from the source, at which 5 % of the NO 2 maximum reaction rate is reached and thus NO x steady state can be assumed. (3) The remainingĮrrors by ∕ ratio correction can be significant when Mobile DOAS measurements is between 1 and 4 m s −1. More measurement times can lower the fluxĮrror that results from wind field uncertainty. Main error source of SO 2 flux (for NO x this error also increases, but When measuring close to the source, low samplingįrequency results in large errors, and wind field uncertainty becomes the The threshold for the undetectable flux can be lowered by Slant column densities (SCDs) are under the detection limit) resulting from wind dispersion is the mainĮrror source. (2) When measuring far from the source, undetectable flux (measured Following the analysis, weĬonclude that (1) the proper sampling resolution should be between 5 andĥ0 m. Simulation with a modified Gaussian plume model. Recommendations for the optimum settings of such measurements via a Mobile DOAS measurements from point sources, and we also offered In this study, we focused on the error budget of Including point sources (e.g., individual power plants) and area emitters Has become an important tool for the quantification of emission sources, Mobile differential optical absorption spectroscopy (mobile DOAS)

Gaussian dispersion model