As one of the major atmospheric pollutants, the airborne particulate matter (PM) has aroused the public attention all around the world. Comparatively, mhalable PM_(10) (with the aerodynamic diameter d_a<10μm) and fine PM_(2.5) (d_a<2.5 μm) do more harm to the human health than suspended particles (d_a<30 μm or 100 μm), due to their longer residence time in environments and higher ability of carrying toxic elements [1, 2]. These small particles can easily penetrate into human lungs and cause severe diseases or permanent damages of the respiratory system [2].
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