The study of indoor air quality did not achieve any public prominence until the 1970s. This was brought on by the “Oil Shock” that rapidly pushed energy prices to unprecedented highs. The response from building managers in the United States and elsewhere was to reduce the fresh air entering a building and recirculate as much as possible to retain heat in winter and keep out heat in summer.
For more details:
http://theconversation.com/we-cant-afford-to-ignore-indoor-air-quality-our-lives-depend-on-it-87329
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