Dayglow radiation at 7319 ¿ has been measured by the visible airglow experiment on Atmosphere Explorer C. The overhead surface brightness measured at 15.4 hours local solar time on January 27, 1974, was 250¿10 R. The volume emission rate had a peak value of 20 photons cm-3 s-1 at a height of about 210 km. The data show clear evidence of quenching by collisions with thermal electrons at the higher altitudes and with neutral particles at lower altitudes. Quenching by neutral particles occurs at nearly the gas kinetic rate.