Current values of nitrogen oxide concentrations in the atmosphere

Maximum admitted value 255ppmv

Acid4 plant at 16-12-2018 00:58:14 : 61 ppmv
Acid2 plant at 16-12-2018 00:58:18 : 60 ppmv
Acid3 plant at 16-12-2018 00:58:20 : 63 ppmv