2. Unit 9 Causes and effects of air pollution Unit 9 Causes and effects of air pollution

3. What causes air pollution? Unit 9 Causes and effects of air pollution Nature Volcanoes emit large amount of gases and ash into the sky whey they erupt.

4. What causes air pollution? Unit 9 Causes and effects of air pollution Nature Carbon dioxide is emitted and the ashes are carried by wind over a wide area when forests catch fire. Nature Carbon dioxide is emitted and the ashes are carried by wind over a wide area when forests catch fire.

5. What causes air pollution? Unit 9 Causes and effects of air pollution Nature Pollen from plants and trees is another pollutant from nature. Nature Pollen from plants and trees is another pollutant from nature.

6. What causes air pollution? Unit 9 Causes and effects of air pollution Industries The burning of fossil fuels produce pollutants such as carbon dioxide and sulphur dioxide. Industries The burning of fossil fuels produce pollutants such as carbon dioxide and sulphur dioxide.

7. What causes air pollution? Unit 9 Causes and effects of air pollution Farming A lot of forests are being cleared for farming by burning. Carbon dioxide is released. Farming A lot of forests are being cleared for farming by burning. Carbon dioxide is released.

8. What causes air pollution? Unit 9 Causes and effects of air pollution Cattle ranch Farming Methane is released from rice fields and cattle ranches. Farming Methane is released from rice fields and cattle ranches.

9. Unit 9 Causes and effects of air pollution Regions in the world most affected by air pollution Regions affected by air pollution km Buenos Aires Beijing GuangzhouShanghai Tianjin Hong Kong San Francisco Los Angeles New Orleans Philadelphia Chicago Toronto Montreal New York Osaka Tokyo Cairo Paris Berlin Amsterdam London  N

10. How are we affected by air pollution? Health problems Unit 9 Causes and effects of air pollution Cigarette smoke and gases from cars cause heart diseases Dust, cigarette smoke, sulphur dioxide cause breathing problems and lung diseases Sulphur dioxide, nitrogen dioxide, ozone irritate eyes, nose, ears and throat Lead damages the brain of children

11. Unit 9 Causes and effects of air pollution How are we affected by air pollution? Effects on trees, crops and fish Pollutants like sulphur dioxide, nitrogen oxides and ozone kill plants and trees. Acid rain kills fish and water plants in rivers and lakes. Many lakes in Norway, Sweden and Canada are fishless because the water in them is acidic.

12. How are we affected by air pollution? Unit 9 Causes and effects of air pollution Pollutants in the air corrode buildings and statues. A lot of money is needed to clean and repair them. Corrosion of buildings and statues In 1908In 1968

13. How are we affected by air pollution? Unit 9 Causes and effects of air pollution Changes in weather and climate The temperature of the world is increasing during the last century.

14. Unit 9 Causes and effects of air pollution How are we affected by air pollution? Changes in weather and climate Global warming caused by greenhouse gases leads to the melting of polar ice sheets. The sea level rises and low-lying coastal regions are drowned. Flooding in Venice