Some Facts About Ozone Layer

• The discovery of the ozone hole was first announced in a paper by British Antarctic Survey's Joe Farman, Brian Gardiner and Jonathan Shaklin, which appeared in the journal ''Nature'' in May 1985.
• Ozone in the atmosphere is measured using Dobson Spectrophotometer - equipment designed in the 1920s, but still the world standard. 
• Ozone is measured in Dobson Units, DU and a typical measurement is about 300 DU.
• If ozone layer was brought down to the earths surface in a vertical column, air pressure and temperature conditions would compress the ozone and it would form a layer just 2 to 5 mm thick.
• Major volcanic eruptions, such as the 1991 eruption of Mount Pinatubo in the Philippines may put material which enhances ozone depletion into the stratosphere.
• Scientists working in Antarctica wear high factor sunscreen to avoid sunburn when working outside, especially as sunlight is also reflected from snow surface. you can get burnt as little as five minutes without it.