| 1. | Ventilation with outdoor air containing elevated ozone concentrations may complicate remediation attempts.
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| 2. | High ozone concentrations damage the leaves and needles of trees.
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| 3. | Normally, at this time of year, the ozone concentration is 350 Dobson Units over England.
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| 4. | The smoke boosted ozone concentrations in Salt Lake City to its highest level since 1989.
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| 5. | They took data at three different stations, each with different meteorological conditions and ozone concentrations.
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| 6. | For example, increasing ozone concentrations to unsafe levels can increase the risk of asthma attacks.
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| 7. | Sometimes, higher ozone concentrations also accompanied the plumes.
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| 8. | Radiosondes measuring ozone concentration are known as ozonesondes.
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| 9. | Ozone concentrations tend to increase at higher altitudes as some ozone from the stratosphere disperses downward.
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| 10. | There is a large area of low ozone concentration or " ozone hole " over Antarctica.
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