It’s high season in the nation’s national parks as millions of visitors come to see nature. If last year’s visitor figures hold up — and early indications suggest they will — will see the ,polo femme, the most visited national park. Three other parks — ( in 2011) () and () — combined will attract roughly the same number.
Yet many visitors are likely to find their view of the natural landscapes softened,borse gucci prezzi With Teeology, Jennifer Lopez I,polo homme,polo femme, if not significantly obscured,ralph lauren, by haze or smog from civilization.
An to the Clean Air Act passed 35 years ago was designed to ensure that when visitors get to their destinations,polo ralph lauren,ralph lauren pas cher, they will be able to see the parks’ vistas.
For the better part of those years,gucci,polo ralph lauren pas cher borse louis vuitton List of 49 ET,abercrombie pas cher, there has been a tug of war between the owners of manufacturing concerns — particularly coal-fired power-plants — and the Environmental Protection Agency over how far the agency can go in requiring plants to cut down on three pollutants linked to haze: fine particles,polo ralph lauren pas cher air jordan Is there any reason to,abercrombie,borse chanel prezzi, which blur the air on their own, and sulfur dioxide and oxides of nitrogen,abercrombie and fitch,polo ralph lauren Christine Haughney - Media Decod, which break down into other smog-producing chemicals with the sun’s help.
The 1977 law, and a that followed it in 1999, are intended to protect visibility in . The most recent of air quality in the parks showed that visibility was stable or improving in the vast majority of them. But it noted that if a place with bad visibility remains stable,borse chanel, that is not particularly good news.
Now, working to avoid for excessive delays, the E.P.A. says it has approved 11 state cleanup plans and provisionally approved another 11 with small modifications that do not impose new requirements. It has also proposed to approve eight more state plans.
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