It has long been proven that there is a direct relationship between the rise in pulmonary disease and the large amount of dust, sulfur dioxide, carbon monoxide, and other chemicals produced by cars and factories.
呼吸道疾病的增加，早經證實和車輛、工廠產生的大量灰塵、二氧化硫、一氧化碳、氮氧化物等化學、有機物質有關。