Sulfur particles, which could cause diseases, were the main powder of smog. And activated carbon had the very adsorption characteristics. Therefore, five sulfur particles were adsorbed by activated carbon and were analyzed by FT-IR. The optimal adsorption time were 120 min of Na₂SO₃, 120 min of Na₂S₂O₈, 120 min of Na₂SO₄, 120 min of Fe₂(SO₄)₃ and 120 min of S. FT-IR spectra showed that activated carbon had the eight characteristic absorption of S-S stretch, H₂O stretch, O-H stretch, -C-H stretch, conjugated C[bond, double bond]O stretch or C[bond, double bond]C stretch, CH₂ bend, C-O stretch and acetylenic C-H bend vibrations at 3850 cm^-1, 3740 cm^-1, 3430 cm^-1, 2920 cm^-1, 1630 cm^-1, 1390 cm^-1, 1110 cm^-1 and 600 cm^-1, respectively. For Na₂SO₃, the peaks at 2920 cm^-1, 1630 cm^-1, 1390 cm^-1 and 1110 cm^-1 achieved the maximum at 20 min. For Na₂S₂O₈, the peaks at 3850 cm^-1, 3740 cm^-1 and 2920 cm^-1 achieved the maximum at 60 min. The peaks at 1390 cm^-1, 1110 cm^-1 and 600 cm^-1 achieved the maximum at 40 min. For Na₂SO₄, the peaks at 3430 cm^-1, 2920 cm^-1, 1630 cm^-1, 1390 cm^-1, 1110 cm^-1 and 600 cm^-1 achieved the maximum at 60 min. For Fe₂(SO₄)₃, the peaks at 1390 cm^-1, 1110 cm^-1 and 600 cm^-1 achieved the maximum at 20 min. For S, the peaks at 1630 cm^-1, 1390 cm^-1 and 600 cm^-1 achieved the maximum at 120 min. It provided that activated carbon could remove sulfur particles from smog air to restrain many anaphylactic diseases.

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