Current values of nitrogen oxide concentrations in the atmosphere

Maximum admitted value 255ppmv

Acid4 plant at 21-10-2017 22:26:15 : 47 ppmv
Acid2 plant at 21-10-2017 22:26:15 : 75 ppmv
Acid3 plant at 21-10-2017 22:26:15 : 58 ppmv