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Q: SCR systems can also use urea as a reagent, and it is becoming preferred to ammonia in many cases because of its safety. Urea is a commonly available chemical with approximately 11,760,000 tons of domestic annual production capacity.
A:
SCR systems can use urea as a reagent, it is becoming preferred to ammonia because its safe. Urea is an available chemical with about 11 million tons of annual production.