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                                    Name one source and one harmful effect of each of the following air pollutants : (a) Sulphur dioxide (b) Nitrogen oxides (c) Carbon monoxide (d) Chlorofluorocarbons (CFCs) | 
                            
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Answer»  Name one source and one harmful effect of each of the following air pollutants : (a) Sulphur dioxide (b) Nitrogen oxides (c) Carbon monoxide (d) Chlorofluorocarbons (CFCs)  | 
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