An IR Fourier-transformed spectrometer for use in field observation, named the tropospheric infrared interferometric sounder (TIIS), was developed by the Central Research Institute of Electric Power Industry (CRIEPI). Downwelling atmospheric infrared emission spectra were measured by ground-based operation of the TIIS in the Tokyo area. From the measured spectra, the aerosol extinction coefficient spectra in the lowest layer (0--2 km) were retrieved, and then using the retrieved aerosol extinction coefficient spectra we carried out the retrieval of the volume density of each aerosol component, in which aerosols in the lowest layer of the urban area were assumed to consist of three components, namely, water-soluble, soot, and dust-like components. The results were evaluated by means of comparisons with backscattering intensity profiles and the size-selective particle number density, which were measured from synchronized operations of a lidar and a laser particle counter, respectively. The retrieved values of water-soluble and dust-like aerosol components were found to correspond with results from the lidar measurement and the laser particle counter. Regarding the soot component, we were unable to make a direct comparison using data measured by the lidar and the laser particle counter. However, the spectrum calculated by FASCODE3 applying the retrieved aerosol parameters corresponded closely to the spectrum measured by TIIS. Therefore, the retrieved soot aerosol parameters were considered to be reliable.