Coal is the undisputed leader in dirty fuel sources. But beyond the issue of global warming/climate change (burning coal is the number one source of the greenhouse gas, carbon dioxide), coal-fired power plants also release dangerously high levels of sulfur dioxide, nitrogen oxide, mercury, arsenic, lead, carbon monoxide and hydrocarbons into the atmosphere, creating environmental hazards both near the plants (i.e smog, respiratory complications, fouled water from coal-slurry impoundments), and far from the plants (i.e acid rain, mercury pollution in rivers and oceans, etc.). And that is only the burning of coal, to say nothing of the mining and transportation of it.
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