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. The Tropospheric Monitoring Instrument (TROPOMI) on the Sentinel-5 Precursorsatellite provides measurements of carbon monoxide (CO) total columnconcentrations based on earthshine radiance measurements in the2.3  µ m spectral range with a spatial resolution of 7 km×7 km and daily global coverage. Due to the highaccuracy of the observations, CO pollution can be detected over cities andindustrial areas using single orbit overpasses. In this study, we analyzedlocal CO enhancements in an area around Iran from 1 November to 20 December 2017. We employed the Weather Research and Forecasting (WRF) model v3.8.1using the EDGAR v4.2 emission inventory and evaluated CO emissions from thecities of Tehran, Yerevan, Urmia, and Tabriz on a spatial resolutioncomparable to that of TROPOMI. For background conditions, the WRF simulationagrees well with TROPOMI CO, with a mean difference of 5.7 %. However,the emissions for the city area had to be significantly increased in order tomatch the observations. Moreover, significant differences at the sub-cityscale remain. To match the TROPOMI CO observations around the Armenian cityof Yerevan, it is necessary to introduce CO emissions along a southeastarterial road of Yerevan. Overall, this hints at deficits in the EDGARinventory in the region around Iran and indicates TROPOMI's capability toidentify localized CO pollution on sub-city scales, which at the same timechallenges current atmospheric modeling at high spatial and temporalresolution.

Carbon monoxide air pollution on sub-city scales and along arterial roads detected by the Tropospheric Monitoring Instrument