Decrease in the NOx concentration during the photochemical
reaction.
The concentration of NOx was a sensitive factor in ozone formation,which involves a NO-to-NO2 conversion reaction to form O3 in the presence of NMHC, M (the third body) and light with a the unknown organic compounds depend on the initial NOx concentrations.The formation of the unknown organic nitrate due to the use of biodiesel and diesel fuels will be investigated in future work.