A numerical analysis with sensitivity analysis on diurnal cycle of NO
x and O
3 was investigated to specify prime reactions with high impact on O
3 deplations by emissions of exhaust gases. NO
x concentration was measured in a vaccum chamber with emission of low-pressure mercury lamp, and numerical analysis of reactions in the chamber was conducted. Fifth-order BDF method was employed to calculate ordinary differential equations of concentrations and sensitivities. Reactions with high sensitivity for O
3 concentration were limited, and chemical kinetics used in this calculation express history of NO
x concentrations correctly in the chamber. This chemical kinetics was applied to the calculations of diurnal cycle of O
3 concentration in stratosphere. As a result of this study, prime reactions with high sensitivities on O
3 concentration is specified and history of concentrations of NO
x, HO
x and O
x was derived. Characteristics of NO
x, HO
x and O
x chemistry in the stratosphere was specified.
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