Worth auditing the room for irritants while you are at it, because their airways are very sensitive and the triggers are mostly things people do not think of as fumes. Aerosols, air freshener, perfume, scented candles, plug-ins, smoke of any kind, dusty bedding, seed dust.
And keep him out of the kitchen. Overheated non-stick cookware is not an irritant, it is lethal to birds, and that one is worth being inflexible about.