[word=plants] [lemma=","] □
[word=plants] [lemma=","] □ □
[word=plants] [lemma=","] □*
The major sources of air pollution include motor vehicles , stationary point sources - such as coal-burning power plants , refineries , industrial facilities , incinerators , and metal smelters - and consumer products . The same happened with those who worked in chemistry plants , refineries , and transportation .