An ozone generation system comprising: an oxygen supply port; a nitrogen supply port; an ozone generation apparatus (1, 300) that generates ozone from an inflowing raw material gas; and a gas flow rate adjustment apparatus configured such that oxygen supplied from said oxygen supply port and nitrogen supplied from said nitrogen supply port flow into said gas flow rate adjustment apparatus, and said gas flow rate adjustment apparatus adjusts the flow rates of said oxygen and said nitrogen and, after said adjustment, outputs said oxygen and said nitrogen, serving as said raw material gas, to said ozone generation apparatus, said gas flow rate adjustment apparatus including a first oxygen flow rate adjustment part connected to said oxygen supply port, and configured to adjust the flow rate of said oxygen supplied from said oxygen supply port, a second oxygen flow rate adjustment part connected to said oxygen supply port, and configured to adjust the flow rate of said oxygen supplied from said oxygen supply port, a nitrogen flow rate adjustment part (73, 731) connected to said nitrogen supply port, and configured to adjust the flow rate of said nitrogen supplied from said nitrogen supply port, and a mixed gas flow rate adjustment part (75, 751) configured to adjust the flow rate of a first mixed gas including said oxygen outputted from said second oxygen flow rate adjustment part and said nitrogen outputted from said nitrogen flow rate adjustment part, said gas flow rate adjustment apparatus being configured to output a second mixed gas, serving as said raw material gas, to said ozone generation apparatus, said second mixed gas including said oxygen outputted from said first oxygen flow rate adjustment part and said first mixed gas outputted from said mixed gas flow rate adjustment part, said gas flow rate adjustment apparatus being configured to generate said second mixed gas such that said second mixed gas contains said nitrogen added to said oxygen with the rate of addition of said nitrogen being set in a range of more than 0 PPM and not more than 100 PPM, by using said first oxygen flow rate adjustment part, said second oxygen flow rate adjustment part, said nitrogen flow rate adjustment part, and said mixed gas flow rate adjustment part. an oxygen supply port; a nitrogen supply port; an ozone generation apparatus (1, 300) that generates ozone from an inflowing raw material gas; and a gas flow rate adjustment apparatus configured such that oxygen supplied from said oxygen supply port and nitrogen supplied from said nitrogen supply port flow into said gas flow rate adjustment apparatus, and said gas flow rate adjustment apparatus adjusts the flow rates of said oxygen and said nitrogen and, after said adjustment, outputs said oxygen and said nitrogen, serving as said raw material gas, to said ozone generation apparatus, a first oxygen flow rate adjustment part connected to said oxygen supply port, and configured to adjust the flow rate of said oxygen supplied from said oxygen supply port, a second oxygen flow rate adjustment part connected to said oxygen supply port, and configured to adjust the flow rate of said oxygen supplied from said oxygen supply port, a nitrogen flow rate adjustment part (73, 731) connected to said nitrogen supply port, and configured to adjust the flow rate of said nitrogen supplied from said nitrogen supply port, and a mixed gas flow rate adjustment part (75, 751) configured to adjust the flow rate of a first mixed gas including said oxygen outputted from said second oxygen flow rate adjustment part and said nitrogen outputted from said nitrogen flow rate adjustment part,