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01
Environmental Protection Agency (EPA)
https://www.epa.gov/indoor-air-quality-iaq/introduction-indoor-air-quality
02
American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE)
.https://www.ashrae.org/technical-resources/bookstore/indoor-air-quality-guide
03
Consumer Product Safety Commission (CPSC)
04
National Air Filtration Association (NAFA)
https://www.nafahq.org/understanding-merv-nafa-users-guide-to-ansi-ashrae-52-2/