Most modern refrigerants used in residential and automotive air conditioning systems—such as R-410A and R-134a—possess low toxicity levels and are non-flammable under normal atmospheric conditions, meaning a minor, well-ventilated leak will not poison you. However, they are not entirely harmless; inhaling high concentrations of refrigerant vapors in a tightly enclosed, unventilated space displaces vital oxygen in the air, which can lead to asphyxiation, dizziness, headaches, nausea, and coordination loss. Furthermore, when certain refrigerants come into direct contact with an open flame, glowing cigarette, or extreme heat source, they can thermally decompose into highly toxic chemical byproducts like phosgene gas and hydrofluoric acid. You can troubleshoot by ventilating the area immediately. You can verify safety when professional technicians repair leaks, evacuate lines, and recharge systems safely.
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