Recent experimental results indicate that the collision cross sections between infrared-absorbing molecules and non-absorbing colliding partners exhibit considerable temperature dependence in the atmospheric temperature range. This dependence has to be taken into account when deconvoluting solar spectra into molecular mixing ratios. On the basis of experimental results for the HC1-Ar system, a simple calculation is made to assess the magnitude of this effect for HC1-air. The calculated temperature effect is found to be small (approximately 4 percent). However, conditions where this effect is much larger and more significant are discussed. The direction of the effect is clear. The increasing cross sections (with decreasing temperatures) lead to smaller deduced concentrations. Since this is potentially a significant correction affecting not only the absolute magnitudes of mixing ratios but also the altitude profiles of HC1 and other key atmospheric components, it is suggested that the definitive experiments be carried out for the various atmospheric broadening systems.