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California Air Resources Board (ARB) - https://ww2.arb.ca.gov/

California Department of Public Health (CDPH) - https://www.cdph.ca.gov/
Centers for Disease Control and Prevention (CDC) - https://www.cdc.gov/nceh/airpollution/airquality/default.htm
European Commission - http://indoor-air-quality.jrc.ec.europa.eu/
European Environment Agency - https://www.eea.europa.eu/signals/signals-2013/articles/indoor-air-quality
Federation of European Heating, Ventilation and Air Conditioning Associations (REHVA) - http://www.rehva.eu/eu-regulations/indoor-environmental-quality.html
Lawrence Berkeley National Laboratory (LBNL) IAQ Scientific Findings Resource Bank - https://iaqscience.lbl.gov/
National Institute for Occupational Safety and Health (NIOSH) - https://www.cdc.gov/niosh/index.htm
United States Environmental Protection Agency (EPA) - https://www.epa.gov/
World Health Organization (WHO) - http://www.euro.who.int/en/health-topics/environment-and-health/air-quality/policy/who-guidelines-for-indoor-air-quality

American Conference of Governmental Industrial Hygienists (ACGIH) - https://www.acgih.org/

American Industrial Hygiene Association (AIHA) - https://www.aiha.org/Pages/default.aspx
American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) - https://www.ashrae.org/
Federation of European Heating, Ventilation and Air Conditioning Associations (REHVA) - http://www.rehva.eu/
Indian Society of Heating Refrigeration and Air-conditioning Engineers (ISHRAE) - http://www.ishrae.in/ 
International Society of Exposure Science (ISES) - https://www.intlexposurescience.org/
International Society for Environmental Epidemiology (ISEE) - https://www.iseepi.org/
Korean Society of Indoor Environment (KOSIE) - http://www.pciaonline.org/node/178;  http://www.kosie.or.kr 
Society of Heating, Air-Conditioning and Sanitary Engineers of Japan (SHASE) - http://www.shasej.org/  (Japanese)
http://www.shasej.org/English/SHASE_pamphlet.pdf (English summary)