Bonn Agreement - ° . 
AccorddeBonn Monitoring NO, compliance 
*r 
BUNDESAMT FÜR 
SEESCHIFFFAHRT 
UND 
HYDROGRAPHIF 
NO — NO, ratio as a function of plume age 
20 
__ 18 
2 16 
Q 14 
©. 12 
— 10 
o 8 
Ss 6 
9 4 
7 
() 
O0 1 
2 
7 m 
a } 
2 
4168 analysed Plumes, measured between 2018 and 2020 in Kiel 
-0.48In(x) + 2.4953 
5 
: 4 
bl 
5 6 7 
8 
9 10 11 12 13 14 
Age of plume [min] 
NO/NO-„, ratio 
decrease with 
increasing plume age 
due to oxidation of 
NO to NO, 
Ratio most variable 
for plumes younger 
than 3 min and more 
stable if plume age is 
longer 8 min