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Fred and Jamy leave the countryside and go to Paris to investigate air pollution. They meet us at Airparif where data on air quality is transmitted. After a brief update on the composition of the air we breathe in the countryside and in the city, they show us that pollution can also come from sources such as termites, volcanoes, swamps, or methane (the simplest natural gas!). From the top of his bike, Fred then explains to us where air pollution comes from and how it can be measured, and finally tackles the famous hole in the ozone layer and the consequences it has on our global environment.