1. WOOOOOSH AYY LMAO OZONE

2. What is ozone? - and why do we need it? Ozone molecules contain 3 oxygen atoms It's present naturally in the atmosphere It protects us from dangerous radiation from the sun The ozone layer is essential for life on earth Without an ozone layer there would also be several negative effects on our health

3. Before the Montreal Protocol came into effect we used a lot of chlorofluorocarbon CFC was used in many different things It's the chlorine in CFC that reacts with ozone causing it to break down The ozone layer breaks down every year even without the help of humans WHY DID THE OZONE LAYER START TO DISAPPEAR?

4. DU is short for dobson unit Dobson unit measures density of a gas 300 DU is a 3mm layer of ozone The ozone level is expected to rise first in 2015 due to the Montreal Protocol The protocol entered into force on January 1, 1989 It's purpose was to limit the use of substances that harms the ozone levels THE MONTREAL PROTOCOL

5. G.M.B. Dobson introduced the world to the ozone spectrophotometer in 1924 That's why the unit for is called DU, or Dobson Units It provided a way of measuring ozone It compares the intensity of UV-radiation in different wavelengths HOW DO WE MEASURE OZONE?

6. DU IN NORRKÖPING, SWEDEN

7. Ozone is created by UV-radiation splitting oxygen molecules An oxygen atom reacts with an oxygen molecule and ozone is created For the most part this process takes place in the stratosphere The angle of the incoming UV-radiation is important THE WEATHERS EFFECT ON OZONE

8. ENVIRONMENTAL EFFECTS OF A LOWERED OZONE LEVEL Every year a big ozone hole appears over Antarctica Due to the hole the temperature rises causing more ice to melt

9. The melting ice raises the sealevel A raised sealevel can lead to several countries just in Europe being under the new sealevel

10. SUMMARY The decline of ozone is no longer a big issue due to the Montreal Protocol Even though there hasn’t been much of an increase of ozone since the agreement, but in the long term there will be a large increase of ozone after 2015 Meaning the problem is pretty much solved, as long as we don’t start using an other substance that destroys our ozone