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The air pollution in the small town is getting worse. People have to wear thick masks almost every ...

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The shortage of energy and air pollution.  The shortage of energy and the shortage of empty land for holding garbage.  Air pollution and the shortage of empty land for holding garbage.  Air pollution and the shortage of fossil fuel.  
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manufacturers will not take care of pollution control on their own will  few manufacturers are aware of the importance of air-pollution control  air-pollution control devices are more expensive than other devices  people like to buy cars that are equipped with pollution control devices  

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