Harvard Six Cities Study

The Harvard Six Cities Study was a landmark research project conducted in the late 20th century that examined how air pollution affects public health. It tracked six U.S. cities over several years, analyzing air quality data alongside residents’ health records. The study found a strong link between polluted air and increased rates of respiratory and heart diseases, as well as higher death rates. Its findings provided compelling evidence that reducing air pollution can significantly improve health outcomes, influencing environmental policies and efforts to improve air quality nationwide.