But you note there is no smell of ozone in here.

Usually there is a fine balance between the build up and loss of ozone.

Thus, there are many environmental initiatives to lower the amount of ozone in the air.

However, even the small amount of ozone plays a key role in the atmosphere.

Both sites were cleaned up with the use of ozone.

For another, the health effects of ozone have been observed at very low exposure levels.

Higher air temperature also increase the concentration of ozone at ground level.

Peak levels of ozone are reduced, but only from 200 parts per billion to 199.

The same cannot be said of ozone, if used indiscriminately.

There was a strong tang of ozone in the air.