reforming, an emission factor of 0.175 kg/tonne NH3 is seen as a benchmark. Table I: 1,8. Nitric acid Ammonia. AN. CAN. Urea. UAN. Methanol. Carbon dioxide. R e la In this example, 360 tonnes/hour steam are provided by the ammonia plant. normally containing 1500 – 2000 ppm of ammonia and 800 – 1200 ppm.