The list below gives some of the health, government and scientific sources referenced by our website.

The Scientific Advisory Group for Emergencies (SAGE), "Application of CO2 monitoring as an approach to managing ventilation to mitigate SARS-CoV-2 transmission", EMG/SPI-B report S1256

The Health and Safety Executive (HSE), "Ventilation in the Workplace" guide,

Burridge H et al. "Predictive and retrospective modelling of airborne infection risk using monitored carbon dioxide". Indoor and Built Environment, 31 (2022)

NASA, Recent atmospheric CO2 measurements,

American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) "Position Document on Indoor Carbon Dioxide", 2022

Ishigaki Y, Enoki K, Yokogawa S, "Accuracy verification of low-cost CO2 concentration measuring devices for general use as a countermeasure against COVID-19"

Andrade A et al. "Infection risk in gyms during physical exercise", Environmental Science and Pollution Research, 25 (2018)

Park J et al. "Critical factors and thresholds for user satisfaction on air quality in office environments", Building and Environment, 164 (2019)

Wargocki P et al. "The relationships between classroom air quality and children’s performance in school", Building and Environment, 173 (2020)

Laurent JGC et al. "Associations between Acute Exposures to PM2.5 and Carbon Dioxide Indoors and Cognitive Function in Office Workers: A Multicountry Longitudinal Prospective Observational Study." Environmental Research Letters (2021)

Zhang X et al. "Effects of exposure to carbon dioxide and bioeffluents on perceived air quality, self-assessed acute health symptoms, and cognitive performance." Indoor Air (2017)