spray towers
...that spray towers remove pollutants from exhaust gases by channeling them through a series of chemical sprays?
...that <b id="mwCdM"><a href="./Spray_tower" id="mwCdQ" rel="mw:WikiLink" title="Spray tower">spray towers</a></b> remove <a href="./Pollutant" id="mwCdU" rel="mw:WikiLink" title="Pollutant">pollutants</a> from <a href="./Exhaust_gas" id="mwCdY" rel="mw:WikiLink" title="Exhaust gas">exhaust gases</a> by channeling them through a series of chemical sprays?