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improved slightly on the least-polluted days.
But, instead of seeing the natural range of 115 miles, average visibility was now down to 15 miles. The NPS report also noted acid precipitation in certain areas was degrading streams for native fish. Brook trout fisheries in Shenandoah were being affected.
And, the report confirmed that ozone was injuring vegetation. The sources of the air pollution were fossil-fuel power plants, industrial
94.4%