The rotation axis of the Moon is tilted by only 1.5° relative to the normal of the ecliptic plane and some craters in the lunar polar regions are therefore permanently shadowed. A portion of these PSRs are cold enough (<∼110 K) to trap water ice (Paige, Siegler, et al., 2010;Watson et al., 1961). Volatiles are delivered to the lunar surface by comets and (carbonaceous) meteoroids (Arnold, 1979;Berezhnoy et al., 2012). Among those common volatiles, the strongly polar H 2 O molecule has the lowest vapor pressure and sublimation rate (Watson et al., 1961). Other ices ("super-volatiles" or "hypervolatiles") are trapped at lower temperatures, and are therefore expected to be exceedingly rare. The sublimation rate of solid CO 2 becomes negligible at around 50 K (Zhang & Paige, 2009). Carbon dioxide cold traps, if they exist at all, would lie within the water ice cold traps. Carbon is found, at low concentration ∼100 ppm, in Apollo samples and likely of solar wind origin (Gibson, 1977;Haskin & Warren, 1991). If trapped in unusually cold areas near the lunar poles, carbon may exist at far higher concentration as dry ice, and would be valuable for the production of fuel and biological materials (Cannon, 2021).Diviner, on the Lunar Reconnaissance Orbiter (LRO), provides surface temperature measurements at hundreds of meters resolution and has extensive time coverage (