Which two organizations' standards are referenced regarding indoor air quality?

The standards pertaining to indoor air quality are most accurately referenced from ASHRAE and the EPA. The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) sets standards related to ventilation and acceptable air quality levels in building environments, which are essential for ensuring health and comfort. Meanwhile, the Environmental Protection Agency (EPA) provides guidelines and regulations aimed at protecting public health by improving indoor air quality through various resources and recommendations.

While the National Fire Protection Association (NFPA) focuses on fire safety and prevention standards, it does not specifically address indoor air quality in the same way as ASHRAE and the EPA. Similarly, organizations such as the CDC and WHO are more focused on public health and disease prevention rather than specific indoor air quality standards. Therefore, ASHRAE and the EPA are the primary sources referenced for standards related to maintaining healthy indoor air environments.