Only recently have they ‘discovered’ what has always been a threat to public health: poor indoor air quality.
As a matter of fact, indoor air pollution is ranked in the top five environmental risks to our health.
The United States Environment Protection Authority (EPA) released a publication on "sick building syndrome" in 1991.
The first cause of sick building syndrome listed was inadequate ventilation, which may also occur if heating, ventilating, and air conditioning systems do not effectively distribute air to people in the building.
As a solution to sick building syndrome, the United State EPA recommends the routine maintenance of heating, ventilating, and air conditioning systems.