Table of existing indoor air quality guidelines and associated pollutant limits from World Health Organization, Canada, California, Illinois, and Texas.
i. Health Canada IAQ Guidelines established in: Acetaldehyde (2017); Acrolein (2021); Benzene (2013); Toluene (2011); Xylenes (2021); NO2 (2015); CO (2010); Formaldehyde (2006); CO2 (2021); Ozone (2010); ii. EPA 2016 publication, A Citizen’s Guide to Radon: The Guide to Protecting Yourself and Your Family from Radon; iii. Refers to the exposure above which corrective actions should be taken; iv. No safe level is recommended; reduce exposure levels as low as possible. v. If there are other sources of CO2 indoors aside from exhaling, OSHA guidelines of 5000 ppm 8-hr and 30000 ppm 15-min standards should be used instead; vi. No specific time limit provided.