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spec: 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 . The Board had significant difficulties finding the funds to pay for the construction and the materials , and several requests were made for government funding . How many decades did we let them simmer under an acceptable dictatorship ?