An autonomous indoor/outdoor environmental monitoring station was installed at the Tomb of Nefartari in the Valley of the Queens, Egypt, to record the microclimate of the tomb and to establish a quantitative relation between changes of the microenvironment in the tomb and the presence of visitors. The temperature in the Tomb of Nerertari remained stable ar approximately 29°C year-round, but the relative humidity ranged between 18per thousand in February and 41per thousand in October. The moisture content of the air in the tomb tracked that of the outside, but always remained higher. Emission and dispersion rates of CO₂ and moisture were measured thorugh three controlled experiments conducted in the tomb. The rate of moisture absorption by the tomb immediately following its emission by people entering the tomb was significant in winter, since the winter rate of natural ventilation was high. -- CAL