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