The first line graph illustrates the size of Antarctic ozone hole between 1980 and 2000 in kilometres squared, while the second chart reveals information about the production of hazardous gases in metric tonnes. The units are measured in thousands.
Overall, the size of Antarctic ozone hole has increased over time. On the other hand, the production of H2O2 and Nitrogen Dioxide rose slightly, while Freon declined dramatically to reach the least number in 2000.
The ozone hole in Antarctica started with approximately 50 kilometres squared. It rose sharply until 1990 to reach 200 kilometres squared. For the next 10 years, the size of ozone hole increased slightly to reach roughly 250 kilometres squared in 2000.
In contrast, the production of Freon by industries began with about 150 ton and reached the peak in 1985 with 200 ton. Finally, it saw a rapid decline to reach the lowest point in 2000 with 20 ton. Moreover, there was no production of NO2 in 1980 and climbed to 20 ton in 1990. However, it started to rise immedietly to reach 80 ton after 10 years. Last and not least, the production of H2O2 initiated with 100 ton, increased slightly, and then had an upward trend in 1990 to reach the highest point in 2000 with 160 ton.
