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Calif. (AP) — The Sierra Nevada forest that is home to the biggest and oldest living things on earth — the giant Sequoia redwoods — also suffers a dubious distinction. It has the worst air pollution of any national park in the country.
Air quality in Vanderburgh County is improving, according to findings of the American Lung Association and U.S. Environmental Protection Agency trumpeted by local authorities Thursday. But the numbers come with more than one cautionary asterisk, said
The report by PennEnvironment, a statewide environmental group, found that in 2009 Pennsylvania's 47 power plants emitted almost 110,000 tons of nitrogen oxides, which mix with other pollutants in the air on warm sunny days to form ground-level ozone,