SOC
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True, largely because they figured out what it really was and established regulations to reduce it. It had nothing directly to do with pathogens. The problem was that new emphasis on reducing energy consumption led some building designers/owners to make their building so tight that there wasn't sufficient fresh air in the buildings. Toxins, CO2, and possibly some pathogens were building up inside the buildings creating an unhealthy environment. New regulations were put in place to require a certain amount of outdoor air to be brought into the building continuously. Sick building syndrome dropped dramatically.Remember when newspapers had articles on 'sick building syndrome'? That seems to have fizzled out.
Sometimes when we try to fix something (energy wastage), we just create another problem (toxin buildup). Life is complicated.