The present invention generally relates to sensors configured to sense concentrations of nitric oxide. The sensors of the present invention generally comprise a selectively permeable membrane, a semi-permeable reference electrode, and a sensing electrode. The membrane generally comprises a dispersed solid electrolyte. The solid electrolyte generally is a nitric oxide trapping agent configured to stabilize the nitric oxide to form stable, oxidizable nitric oxide complexes. The nitric oxide complexes may then diffuse through the membrane and the reference electrode to the sensing electrode where they are oxidized. An electrical current indicative of the concentration of the nitric oxide generated by the oxidation may be transmitted from the sensor to a picoammeter, which may be configured to measure the electrical current and to signal to a user of the sensor the concentration of the nitric oxide.