Infrared SED of the nebula around the LBV AG Car from data collected at different epochs: the ISO-LWS spectrum and color-corrected photometric measurements from IRAS, AKARI and Herschel (PACS and SPIRE) space observatories. Results of the 2-Dust model fitting are illustrated. Data at λ< 20 μm are not considered in the fit. The best fit (solid line) is achieved considering two populations of dust grains (dashed lines).