VOA慢速英语:Low Coal Prices Mean Heavy Smog in China

smog – n. cloudy air caused by air pollution

emission – n. the act of producing or sending out something from a source

capacity – n. the ability to hold or contain people or things

resident – n. someone who lives in a particular place

alert – n. a public warning or notice

translator – n. a person who changes words in one language to another

hydroelectric – adj. of or relating to the production of electricity by using machines powered by moving water

cheap – adj. least costly