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We show that, contrary to simple predictions, most AGNs show at best only asmall increase of lags in the J, H, K, and L bands with increasing wavelength.We suggest that a possible cause of this near simultaneity of the variabilityfrom the near-IR to the mid-IR is that the hot dust is in a hollow bi-conicaloutflow of which we only see the near side. Although most AGNs show nearsimultaneity of IR variability, there was at least one epoch when NGC 4151showed the sharply increasing IR lag with the increase of the wavelength. Thisbehaviour might also be present in GQ Comae. We discuss these results briefly.The relative wavelength independence of IR lags simplifies the use of IR lagsfor estimating cosmological parameters.

The relative wavelength independence of IR lags in active galactic nuclei: implications for the distribution of the hot dust