Urban air pollution is commonly known as smog. The dark London smog that Evelyn wrote of is generally a smoky mixture of carbon monoxide and organic compounds from incomplete combustion of fossil fuels such as coal, and sulfur dioxide from impurities in the fuels. As the smog ages and reacts with oxygen, organic and sulfuric acids condense as droplets, increasing the haze.
- smog [smɔɡ] n.烟雾
- compound [ˈkɔmpaund] n. 混合物
- sulfur [ˈsʌlfə] n. 硫(磺)
- dioxide [daiˈɔksaid] n. 二氧化物
- impurity [imˈpjuəriti] n. 不洁，杂质
- age [eidʒ] v. 老化，陈化
- condense [kənˈdens] v. 浓缩，凝结
- droplet [ˈdrɔplit] n.小滴
- haze [heiz] n. 霾，烟雾，霭
