Why did the bus I was behind on the way home last night stink of ammonia?
^^
https://www.tfl.gov.uk/info-for/media/press-releases/2014/july/world-s-largest-bus-retrofit-programme-compjeted
" 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 "
@NotThamesWater started
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Why did the bus I was behind on the way home last night stink of ammonia?