15 December 1998 Comparison of DOAS and standard monitoring measurements in urban areas
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Abstract
Measurements of air pollutant concentrations made at monitoring stations are often used to validate dispersion calculations in urban areas. A problem arises here, because of monitoring stations provide readings at specific points, whereas dispersion calculations need average values taken over specific computation volumes. By using open-path equipment, a comparison can be made between monitoring measurements and path-averaged measurements. This was carried out in two city areas. In one area it can be assumed that there are no direct pollutant sources, and the emissions are homogeneously distributed in the air. The second area is an inner-city zone with the measurement path covering two roads of very different traffic load. A comparison between a UV-DOAS system and monitoring stations showed that very god correlation could be established in the first area between the readings for NO, NO2 and O3 from the different systems, both in their actual level and in the curve they followed. This was not the case in the second test set-up because of the different emissions situation. Thus the values form such monitoring stations are only suitable for validation purposes under certain conditions.
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Peter J. Sturm, Johannes Rodler, "Comparison of DOAS and standard monitoring measurements in urban areas", Proc. SPIE 3493, Spectroscopic Atmospheric Environmental Monitoring Techniques, (15 December 1998); doi: 10.1117/12.332642; https://doi.org/10.1117/12.332642
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