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Open-path dual-comb spectroscopy provides multi-species atmospheric gasconcentration measurements with high precision. Here, we extend open-path dualcomb spectroscopy to the mid-infrared 5 {\mu}m atmospheric window, enablingatmospheric concentration retrievals of the primary greenhouse gases, N$_2$O,CO$_2$, and H$_2$O as well as the criterion air pollutants O$_3$ and CO across600 m and 2 km round-trip paths. We demonstrate measurements over a five-dayperiod at two-minute temporal resolution with 80% uptime. The achievedprecision is sufficient to resolve the atmospheric concentration variations ofthe multiple gas species; retrieved dry mixing ratios of CO and N$_2$O are ingood agreement with a co-located point sensor. In addition, the retrieved ratioof excess CO vs CO$_2$ agrees with similar urban studies but disagrees with theUS National Emission Inventory by a factor of 3. Our retrieved ratio of excessN$_2$O vs CO$_2$ exhibits a plume-dependent value, indicating the variabilityof sources of the greenhouse gas N$_2$O.

Open-path Dual-comb Spectroscopy for Multispecies Trace Gas Detection in the 4.5 {\mu}m to 5 {\mu}m Spectral Region