Los puntos clave no están disponibles para este artículo en este momento.
In the 1930s, 40s, and 50s, several episodes of extreme air pollution focused attention on the potential for adverse health effects of air pollution. These included an episode in the Meuse Valley, Belgium, in December 1930 ( 15), an episode in Donora, Pennsylvania in 1948 (36), and several episodes in
Dockery et al. (Sun,) studied this question.