The European (ESA-Roscosmos) ExoMars Trace Gas Orbiter finished aerobraking dives and started taking data last April, 28. The Orbiter will specially check methane composition to discern if the gas originated from geological or possible biological sources. The probe includes several ultraviolet and infrared spectrometers. The combination of mid-, near- and far-infrared spectra will provide identification of several atmospheric gases (H2O, O2, CO2, SO2, HF, HCl, etc).
In the picture below the Korolev crater, one of the first images from the orbiter.