| Red: Insufficient control of NOx | No attempts to quantify NOx in all key components. |
| Orange: Both N2 and NOx reduction might occur | The amount of NOx has not been fully quantified in the gas supplies and/or the electrocatalytic tests. |
| Green: NOx reduction is likely to be negligible | The amount of NOx has been quantified in gas supplies and in parallel with ammonia analysis in all key data on the reduction of both 14N2 and 15N2. |
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