Nitrous acid (HONO) emission factors for diesel vehicles determined using a chassis dynamometer
【Abstract】
HONO in diesel vehicle exhaust was measured using a chassis dynamometer system.
HONO was determined by incoherent broadband cavity-enhanced absorption spectroscopy.
HONO/NOx ratios were 2.2–8.5 times higher than those previous studies for gasoline vehicles.
HONO emission factors were estimated to be 7.71–64.70 mg (kg fuel)−1, depending on the driving cycles.
HONO formation is related to particulate matter on diesel particle filters.
Vehicle exhaust gases are important sources of nitrous acid (HONO). In this study, HONO in diesel vehicle exhaust was measured by incoherent broadband cavity-enhanced absorption spectroscopy using a chassis dynamometer system. The mean HONO concentrations in exhaust gases emitted by passenger cars and light-duty trucks were high when the after treatment devices were not fully working during the warming up period. The HONO/NOx ratio is a good index of HONO formation. The HONO/NOx ratios were 9.7 × 10−3–18.1 × 10−3, and were higher than what we found in a previous study. The estimated HONO emission factors were 7.71–64.70 mg (kg fuel)−1, and were lower than were found in previous studies. The results indicated that the frequency particulate matter is removed from a diesel particle filter affects the HONO concentration in the emitted gases and the HONO emission factor.
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【Author】
YoshihiroNakashimaa, YoshinoriKondob
【Keywords】
Nitrous acid, Diesel vehicle emission, Incoherent broadband cavity-enhanced absorption spectroscopy, Emission factor, Chassis dynamometer 
【Journal】
Science of The Total Environment(IF：5.6) Time：2021-10-14
