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    Clean air is made up of only nitrogen, oxygen, and water. As we have industrialized, our cities have grown and traffic has increased. With these development there has come an increase in the number of by-products released into the air, such as particles（细粒）from burning fuels and poisonous gases from chemical reactions. These gases become pollutants.

    Air pollution has a bad effect on the earth and our environment. Air pollution can result in acid rain, and it can also lead to the Greenhouse Effect—a condition in which pollution stops radiation from traveling out of the Earth’s atmosphere. This upset to the natural process means that temperatures on Earth may not be maintained within natural ranges. Due to the Greenhouse Effect, temperatures on Earth become warmer, which is known as global warming. What’s worse, air pollution may produce holes in the ozone layer（臭氧层）— this layer of ozone naturally prevents ultra-violet rays （紫外线） from the sun reaching Earth. Holes make it possible for the rays to reach us.

    Don’t let all the bad news about air pollution get you down because there are many ways to help fight the air pollution. Every one of us can employ a variety of air pollution solutions. A smoker can give up smoking. While shopping, you can choose organic and natural cleaning products. Driving less and carpool more can also contribute to less pollution. Next time, keep your air-conditioning low. Of course you can plant more trees.

    Air pollution is a major problem for our planet. However, as long as we realize how serious the air pollution is and take actions now, everyone can make a difference!

                         Title:71.         

    72.         

    75.         

    Growing cities

    76__________

    Bad results

    77.         

    Greenhouse Effect

    78.         

    Holes in the ozone layer

    73.         

    79.         

    Choosing organic and natural cleaning products

    Driving less and carpool more

    80.         

    Planting more trees

    74.         

    Everyone can make a difference

    71. Air pollution 72. Major causes 73. Solutions7 4. Conclusion 75. industrialization 76. increasing traffic 77. acid rain 78. global warming  79. stopping smoking  80. keeping air-conditioning low

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