ozone day

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Across
  1. 3. How much ozone can one kilogram of halon 1211 destroy?(in Tonnes)
  2. 5. an Amendment to Montreal Protocol in (2016) to phase down HFCs
  3. 7. In which season is the ozone found at its maximum level in the northern hemisphere?
  4. 9. Which device can be used to measure ozone in the stratosphere from the ground?
Down
  1. 1. The longest of the UV-B radiations reach the surface of the earth is small fractions and aids in _____ production of the skin.
  2. 2. Ozone is an _______ of oxygen
  3. 3. The CFC used in refrigerators is
  4. 4. Which gas prevents extremely short wavelengths or vacuum UV radiations (10-100nm) from reaching the surface.
  5. 6. ozone depleting substances and synthetic greenhouse gases commonly used as propellants in _______ products?
  6. 8. In 1913,______ Buisson and Charles Fabry discovered the ozone layer