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Environmental Pollution
Pollution controls needed for coal-fired plants [Letter]
Pollution controls needed for coal-fired plants [Letter]

The Maryland Department of the Environment recently revealed a draft rule that would finally require coal-powered plants in the Baltimore-Washington region to reduce nitrogen oxide emissions by 48 percent over the next four years ("New coal plant pollution controls eyed," Sept. 13). Nitrogen oxides contribute heavily to the formation of ground-level ozone (smog) and seriously exacerbate cardiopulmonary health problems such as asthma. Smog is worse when air is still and hot, but 2014 has been relatively cool so there have been fewer "orange alerts" for dangerous air. But Maryland still has some of the worst air on the Eastern seaboard, due largely to coal. Power...