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^^
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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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Greenbank-
The SCR process involves the injection of urea into the exhaust pipe.
https://en.wikipedia.org/wiki/Diesel_exhaust_fluid
Coming soon to a car near you, as some manufacturers will be using SCR to get small diesels to pass Euro 6 tests. If it's working properly, you shouldn't get significant amounts of ammonia in the tail pipe, so stinky buses are likely to be suffering from a defective sensor somewhere.
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the injection of urea into the exhaust pipe.
gbj_tester
NotThamesWater
Why did the bus I was behind on the way home last night stink of ammonia?