In 1988, the driest year and the one with the highest ozone concentrations, 27 of the 28 trees were adversely affected.
22.
This reversal ( Umkehr ) or inversion implies the existence of maximum of ozone concentration at some level in the atmosphere.
23.
The hole, actually an area of depleted ozone concentration high in the atmosphere, remains very large, however, said researcher Richard McPeters.
24.
Environmental protection measures, like restraining movement of heavy vehicles around the fort to maintain the highest atmospheric ozone concentration, were also implemented.
25.
This is due to higher ozone concentrations ( Denver-metro area ) moving to areas of lower ozone concentrations ( rural, mountain areas ).
26.
This is due to higher ozone concentrations ( Denver-metro area ) moving to areas of lower ozone concentrations ( rural, mountain areas ).
27.
In 2005, researcher and mountaineer John Semple established that above-average ozone concentrations on the Tibetan Plateau may pose an additional risk to climbers.
28.
Such symptoms can appear at ozone concentrations as low as . 012 parts per million _ levels typical in many cities, says the report.
29.
In 1992, the ozone concentration over the north polar area dropped by 15 percent, he said, and there was another 25 percent drop in 1993.
30.
She noted that gasoline sold in Georgia is already designed to limit emissions of nitrogen-oxygen compounds known as " NOx " that increase ozone concentrations.
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