References

OSHA:

https://www.osha.gov/SLTC/respiratoryprotection/

https://www.osha.gov/dsg/annotated-pels/

EPA:

https://www.epa.gov/iaq-schools/why-indoor-air-quality-important-schools

https://www.epa.gov/indoor-air-quality-iaq

https://www.epa.gov/indoor-air-quality-iaq/introduction-indoor-air-quality

https://www.epa.gov/report-environment/indoor-air-quality

American Lung Association:

https://www.lung.org/about-us/blog/2017/07/how-your-lungs-work.html

Economic, Environmental and Health Implications of Enhanced Ventilation in Office Buildings, Int. J. Environ. Res. Public Health 2015, 12(11), 14709-14722:

https://doi.org/10.3390/ijerph121114709

Bureau of Labor Statistics:

https://data.bls.gov/timeseries/FWU00X4XXXXX8EN00 

https://data.bls.gov/timeseries/CSU00X4XXXXX6E100