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. 2018 Aug 31;18(9):2893. doi: 10.3390/s18092893

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Top-down derived NO_X emissions estimated from the tropospheric NO₂ line densities for different European cities against the MACC-III emissions as used in LOTOS-EUROS (a). NO_X emissions from LOTOS-EUROS versus MACC-III in red. OMI based versus MACC-III in black. For each NO₂ data set the statistics (slope, intercept, correlation coefficient) are provided. The OMI derived emission of 4.28 ± 1.68 mg m⁻² day⁻¹ for St.-Petersburg is omitted from the figure. (b) The distribution of the difference of the top-down and MACC-3 input emissions.