CO2 Poisoning
CO2 poisoning occurs when breathing air with 5% or more CO2 by volume. The most common symptoms of carbon dioxide poisoning are headaches, dizziness, weakness, chest pain, and confusion. If fresh air is not immediately available, suffocation can occur.
There are no known effects of gaseous CO2 contact with eyes or skin. While it is an odorless gas, many people describe the smell of higher levels of CO2 as a sharp or acidic. This is because the CO2 is creating carbonic acid in your body.
https://www.co2meter.com/en-au/blogs/news/dangers-of-co2-what-you-need-to-know
