Word Count : 241

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Air pollution has serious effects on animals just as it affects human beings. Animals breathe the same air and therefore harmful gases like carbon monoxide, sulfur dioxide, nitrogen oxides, and smoke particles enter their bodies. These pollutants can damage their lungs and cause breathing problems. Birds are especially sensitive because their respiratory systems are very delicate. When the air is ____ ______ _______ _____ ________ ____ _____ ________.
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