It has already been proven that there is a connection between the rise of breathing difficulties and air pollution. But pollution sources are not only the black smoke belched by factories or the exhausts wheezed out by cars, but include everyday products which are olfactorily annoying--like bleach or bug spray.
呼吸道疾病的增加已被證實與空氣污染有關；但除了工廠排放的黑煙、汽車製造的廢氣外，致病因子來自生活中的許多事物。