This molecule, O3, is a pollutant low in the atmosphere; in the stratosphere, it absorbs harmful radiation
... Ozone and oxygen 
molecules in the stratosphere absorb ultraviolet light from the... [DOC] [TLE] Chapter 1 Section 2 [PAR] About 90% of the ozone in our atmosphere is contained in the stratosphere, ... 
are very small, typically only a few molecules O3 per million molecules of air.