High ozone concentrations damage the leaves and needles of trees.

Current meteorological satellites look straight down, measuring total ozone concentrations.

These factors make it difficult to control the ozone concentration in all circumstances.

Increased fire byproducts in the stratosphere can increase ozone concentration beyond safe levels.

The water of this spring attains a dull white hue during early morning probably due to ozone concentration.

For example, increasing ozone concentrations to unsafe levels can increase the risk of asthma attacks.

She went up to the chemistry department and looked up a simple test for ozone concentration.

Finally, it requires Member States to monitor ozone concentrations and to report the results to the public.

We also had very high levels of ozone concentrations all over Europe and the two phenomena are unfortunately linked.

It is also known that pollution in urban areas could produce larger ozone concentrations downwind.