No, KYFE Sauna does not release any chemicals. The tent is constructed of 3 layers: 300D Oxford Nylon on the interior and exterior with 120gsm cotton in between for insulation. The tent windows are made of a high-temperature performance TPU. We conduct tests on our saunas and results indicate that when KYFE Sauna is heated to 200°F, there are zero concentrations of CO or VOCs present in the air.