MONA: measurement of nitrogen oxides NO, NO₂ and NOy^*

MONA allows quick measurement of nitrogen species at low concentrations. It is built around 3 ECO-PHYSICS CLD780TR analyzers that provide a direct measure of NO. Specific conversion pathways have been developed and allow the analysis of NO2 and NOy. A servo system of the sampling developed in collaboration with the INSU-DTallows the instrument to operate avoiding the pressure variations related to changes in altitude.

Its detection limit is 10 pptv in 60 seconds and 50 pptv in 3 seconds.

^* NOy = NO+ NO₂ + HNO₃ + PAN + N₂O₅ + HONO + HO₂NO₂ + NO₃ + + nitrates particulate+ organic nitrate + halogenated nitrogen compounds (ClONO₂, BrONO₂ , NOCl , ..