Train a dog to push a button.
I figure that we can add a sensor and then have the Arduino turn the exhaust fan on and off when odor is present.
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Wire the fan so it's on all the time, or put a timer on it so it's on during office hours.
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Wire the fan to the light switch, maybe with a timer that holds the fan on for 10 or 15 minutes after the light is shut off.
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Use a motion sensor with a timer to hold the fan on for 10-15 minutes.