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There is no single answer to this question. The exhaust of a window AC is cooling air that is drawn in usually from the sides of the AC unit. In the process this air may pick up moisture from condensation inside of the machine and may pick up dust from the evaporator coil inside the unit. I have seen some old units that are dirty and the exhaust if full of dust.

This dust is most likely an irritant and may contain allergens such as dust, pollen and spores which are not good but usually don't fit the definition of toxic. The one conceivable exception to this would be if you have a toxic mold growing in the area being air conditioned or inside the evaporation pan of the unit. Also keep in mind almost all newly manufactured consumer goods are coated with an organic coating that evaporates over the life of the machine. Especially when hot. That "new" smell that electrical equipment often has when it is first operated is a blend of odors from paint solvents, plasticizes, lubricants, plastic resin, etc. The concentrations are so small a single exposure is probably harmless but one must wonder what effect they have over a lifetime.

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Q: Is the exhaust from the back of a window unit ac toxic?
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