A 17-year-old female patient presents to the emergency department with headache, nausea, and dizziness. Her roommate is also in the emergency department for similar symptoms but resolved after leaving home. On exam, the patient's heart rate is 90 beats per minute, and she is maintaining a saturation of 100% on the room air. Except for mild confusion, her neurological examination has no abnormalities. Blood testing confirms her diagnosis, and she improves with oxygen. At which concentration of the offending agent do visual symptoms occur?

1.10 percent
2.20 percent
3.30 percent
4.60 percent

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