Increased automobile fleet generates pollutants which results in a progressive deterioration of environment. Most of the pollutants are organic compounds which emerge from the burning of fossil fuels. Titanium dioxide is a semiconducting material which can degrade the organic compounds in the presence of ultraviolet rays by photocatalysis process. Pavements in which Titanium dioxide is incorporated in order to reduce the SOx and NOx content in the atmosphere by the photocatalysis process is called photocatalytic pavements. TiO2 can be applied to both concrete and asphalt pavements in the form of a thin layer coating on the surface. The efficiency of photoctalytic pavements depend upon pollutants flow rate, UV light intensity, contaminants present on the surface of pavements and relative humidity.
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