7 4
The ozone layer protects us from harmful UV radiation. This radiation can cause health problems. (a) Data on ozone concentration in parts per million (ppm) is displayed using deciles. Look at the graph of ozone concentration in the USA from 1980 to 2009. The data was collected from 255 different sites. 0.15 90% of sites have concentrations below this line average for all sites
0.10 concentration in ppm 0.05
10% of sites have concentrations below this line 0.00 1 9 8 0
1 9 8 1
1 9 8 2
1 9 8 3
1 9 8 4
1 9 8 5
1 9 8 6
1 9 8 7
1 9 8 8
1 9 8 9
1 9 9 0
1 9 9 1
1 9 9 2
1 9 9 3
1 9 9 4
1 9 9 5
1 9 9 6
1 9 9 7
1 9 9 8
1 9 9 9
2 0 0 0
2 0 0 1
2 0 0 2
2 0 0 3
2 0 0 4
2 0 0 5
2 0 0 6
2 0 0 7
2 0 0 8
2 0 0 9
years Using data from the graph describe the trends in the data from 1980 to 2009. ................................................................................................................................................... ................................................................................................................................................... .............................................................................................................................................. [2] (b) The Antarctic ozone hole was discovered in 1985 by British scientists. This led to changes in people’s behaviour across many countries. Describe and explain these changes. ................................................................................................................................................... ................................................................................................................................................... .............................................................................................................................................. [2]
Š OCR 2013
Turn over for the remainder of question 4