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NotThamesWater
Greenbank
^^
https://www.tfl.gov.uk/info-for/media/press-releases/2014/july/world-s-largest-bus-retrofit-programme-compjeted
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The SCR process involves the injection of urea into the exhaust pipe. The urea decomposes and hydrolyses to ammonia (NH3) which reacts with NOx and reduces it to harmless nitrogen and water
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