The Picarro G2301 greenhouse gas concentration analyzer enables simultaneous measurements of CO2 , CH4 with part-per-billion (ppb) sensitivity and negligible drift over months of operation. The G2301 also features Picarro’s unique algorithms to correct for the dilution effect of H2O vapor and to report dry gas mole fractions of CO2 and CH4 . The unique combination of continuous 3-species measurement, high precision, field deployability, and long-term reliability makes the G2301 the instrument of choice for greenhouse gas measurements. Patented Picarro cavity ring-down spectroscopy (CRDS) technology enables an effective measurement path length of up to 20 kilometers in a compact cavity, which results in exceptional precision and sensitivity in a small-footprint analyzer. A meticulously designed small optical cavity incorporates precise temperature and pressure control. As a result, the analyzer delivers a best-in-class combination of precision, accuracy, low drift, and ease-of-use