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<p><a href="page.php?w=wind_turbine">wind turbine</a>s, etc.</p>

<p><big>Purification and waste management</big></p>
<p><big>Water purification</big></p>
<p><big>Air purification</big></p>
<p><a href="page.php?w=Air_purifier">Air purification</a> describes the processes used to remove contaminants and pollutants from the air to reduce the potential adverse effects on humans and the environment. The process of air purification may be performed using methods such as mechanical filtration, ionization, activated carbon adsorption, photocatalytic oxidation, and ultraviolet light</p><p>
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