Yes, pollution is bad, and for those with lung diseases like athsma, its dangerous.
Please don't criticize me for this one; I like nuclear the best. It gives off no air pollution, and when handled properly (that is, not the way the soviets did)
it can actually be pretty green. I like geothermal and hydroelectric the least, as you need to destroy a geyser to make geothermal, and dam up a lush valley to do hydroelectric. Solar is ok, but is best individual houses rather than large plants (i like the idea of getting paid for the extra energy that will actually go into the grid) , as you need to destroy a large area of natural beauty to employ it in a plant. The only down to having it on your house is that the panels are expensive. Another down is that the waste from making the photovoltaic panels is toxic to the environment, but I guess that isn't any worse than nuclear waste. Wind isn't so bad, but you have to have many large wind farms to have much effect.
My conclusion is that a mix of nuclear, wind, and solar on houses is best.