Parameter Tree:
EARTH SCIENCE > ATMOSPHERE > AIR QUALITY > TROPOSPHERIC OZONE

Definition:
Ozone (O3) that is measured in the lowest 10-20 km of the Atmosphere.
While the maximum concentration of ozone occurs between 20-25 km, a
high concentration of ozone close to the Earth's surface is considered a
public health threat.  


Reference:
Glossary of Meteorology, American Meteorological Society, 1998.