The concentrations of nitrogen dioxide and ozone also exceed the objectives for a few days in a year. 二氧化氮及臭氧的浓度，每年也有几天超出了空气质素指标。
Its coal-burning kilns spew out huge quantities of sooty waste and chemical compounds such as sulfur dioxide and nitrogen dioxide. 在这里，烧煤的窑炉喷出大量的黑色废气及二氧化硫和二氧化氮等化合物。
