Introduction: During the SARS-CoV-2-pandemic, face masks have become one of the most
important ubiquitous factors affecting human breathing. It increases the resistance and dead
space volume leading to a re-breathing of CO2. So far, this phenomenon and possible implications
on early life has not been evaluated in depth.

Method: As part of a scoping review, literature was systematically reviewed regarding CO2
exposure and facemask use.

Results: Fresh air has around 0.04% CO2, while wearing masks more than 5 min bears a possible
chronic exposure to carbon dioxide of 1.41% to 3.2% of the inhaled air. Although the buildup is
usually within the short-term exposure limits, long-term exceedances and consequences must be
considered due to experimental data.
US Navy toxicity experts set the exposure limits for submarines carrying a female crew to 0.8% CO2 based on animal studies which indicated an increased risk for stillbirths. Additionally, mammals who were chronically exposed to 0.3% CO2 the experimental data demonstrate a teratogenicity with irreversible neuron damage in the offspring, reduced spatial learning caused by brainstem neuron apoptosis and reduced circulating levels of the insulin-like growth factor-1. With significant impact on three readout parameters (morphological, functional, marker) this chronic 0.3% CO2 exposure has to be defined as being toxic. Additional data exists on the exposure of chronic 0.3% CO2 in adolescent mammals causing neuron destruction, which includes less activity, increased anxiety and impaired learning and memory. There is also data indicating testicular toxicity in adolescents at CO2 inhalation concentrations above 0.5%.

Discussion: There is a possible negative impact risk by imposing extended mask mandates especially for vulnerable subgroups. Circumstantial evidence exists that extended mask use may be
related to current observations of stillbirths and to reduced verbal motor and overall cognitive
performance in children born during the pandemic. A need exists to reconsider mask mandates.


The National Institute for Occupational Safety and Health (NIOSH) has an 8h threshold limit value –
time-weighted average recommended exposure limit (TLV-REL) of 0.5% – and a 15 min threshold limit value – short-term exposure limit (TLV-STEL) of 3% for CO2 – in workplace ambient air [57]. Rhee’s quality study (serial CO2 measurements with a high performance CO2 sensor at a frequency of 1 Hz for 15 min) demonstrates a significant increase in end-tidal CO2 concentrations among
healthy volunteers while donning KN95 respirators

Possible toxicity of chronic carbon dioxide exposure associated with face mask use, particularly in pregnant women, children and adolescents – A scoping review (cell.com)

Damn – the conspiracy theorists were correct again.

It appears public health conducted a mass population medical experiment without seeking consent from those being experimented on by authorities. I believe I read that conducting medical experiments on subjects who have not provided voluntary consent is considered a crime.