OMI and Ground-Based In-Situ Tropospheric Nitrogen Dioxide Observations over Several Important European Cities during 2005-2014.

The OMI space observations show a decreasing trend for the tropospheric NO 2 content over all of the cities presented in this work ( Figure 2 ).

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Using OMI observations we found a negative trend of ~1 ± 0.06% per year.

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